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What Others Have Asked

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Darwin theorized that the finches on the Galapagos Islands were related because the finches... 
A) had the same size beaks. B) ate the same kind of food C) sang the same kind of song. D) were the same size and color.

How the circulatory and respiratory systems are needed to achieve aerobic respiration? 
Because the circulatory system feeds the oxygen to the respiratory system and the respiratory system uses it to feed nutrients to the rest of the body. …

Is there an organ in our body which doesn't have blood? 
There is an organ in the body without blood?

What are basophils? 
Click on post comments to answer.

What is the function of the bone marrow? 
Click on post comments to answer.

Describe how the tissues on the gaseous exchange system contribute to the functioning of the lungs? 
The trachea has cartilage which provides support to the lungs. Click on post comments to answer.

What is reflex action? 
Click on post comments to answer.

What is the difference between catabolism and anabolism? 
What is the concept of both? Click on post comments to answer.

Why complete recovery from injuries to the nervous system may not occur? 
The nerve cells in human nervous system seldom undergo mitosis. Based on this information, explain why complete recovery from injuries to the nervous system …

What is the difference between menstrual cycle and oestrous cycle? 
When I studied menstrous cycle, I came to know that oestrous cycle is one of its components. So i could not understand what could be the difference between …

Blood Types Question 
Assume a male with type O blood mates with a female who has type A blood. The female's mother had type A blood and her father had type B. What is the probability …

In which part of the circulatory system are there valves? 
Which part of the circulatory system are there valves?

Give some advantages and disadvantages of having muscle attached to bones via tendons instead of being attached directly to be bones 
Give some advantages and disadvantages of having muscle attached to bones via tendons instead of being attached directly to be bones. Read Musculoskeletal …

Food provides which two necessities for living things? 
Read Protein Synthesis Made Easy .

What is the connection between the receptors in the skin and the CNS? 
receptors: touch, pain and pressure. Study Nervous System .

What happens if two sperm fertilize an egg? 
Study Reproductive System .

The ______________________ system exerts more prolonged effects on the body via hormones. 
The ______________________ system exerts more prolonged effects on the body via hormones. Read The Immune System .

What is respiration? 
Read Breathing Process .

What is excretion? 
Read The Excretory System .

Briefly explain how the digestive system works. 
Digestion starts from the mouth. What the names of the chemical substances that breaks down the food in the mouth and the stomach. Study Digestion …

Why is it important to excrete waste products? 
Study The Excretory System .

Is a typical feature the short longevity of the epithelial cells? 
Is a typical feature the short longevity of the epitheleal cells? Study Epithelial .

Which of the following bone is unpaired in human body? 
I have some options for this questin to be answerad. 1.Parietal bone, 2.Patella, 3.Occipital ,4.Lacrimal bone. Study Musculoskeletal .

Why is excretion required ? 
Study The Excretory System .

Explain the differences between large intestine and small intestine in terms of their structure that makes both intestines function differently. 
The smaller intestine is also referred to as the small bowel and it is an elongated tube that helps in the passage of the food that comes from our stomach. …

What is internal environment? 
Study Cell Structure .

How do hormones regulate the excretory system? 
If you could help me out that would be great, Thanks! Read The Excretory System .

Which immune system is best at fighting bacterial infections? 
There is not one system which is BETTER at fighting bacterial infections? Study The Immune System .

What is in a stomach if theres no food in there? 
Do the acids completely fill it up? Is it filled with air/if so how does the air get in there? Does the stomach shrivel and shrink? Or is there absolutely …

Where are epithelia found? 
Read Epithelial .

What are the differences between antibody production after a vaccine and after the person was exposed to the pathogen? 
Describe in detail and suggest an explanation for the differences described. Read The Immune System .

Name the structures of the musculoskeletal system. 
Are they the bones, muscles and joint? Study Musculoskeletal .

Why are kidneys two in number? 
Read The Excretory System .

How does an impulse transmit between two neurons? 
How does an impulse transmit between two neurons? Study: Nervous System .

Explain muscle contraction in everyday activities. 
positive contraction- negative contraction- isometric contraction generate force- Study Musculoskeletal .

How does negative feedback work in regulating the level of follicle stimulating hormones during different stages of the menstrual cycle? 
Negative feedback regulates the level of follicle stimulating hormones during different stages of the menstrual cycle. Read Reproductive System .

Describe how the cns is protected from mechanical damage. 
The skull and spine protect the cns. There is also fluid which provides shock absorbance. Study Nervous System .

Why circulation in the vessels does not produce sounds? 
Study The Circulatory System - Complete Review .

How is a tissue formed? 
Tissue formation - how does it work? Not just 'similar cells that group together', but rather HOW do they group together? What makes them adhere? Study …

Describe how an impulse travels through a sensory neuron in the correct direction to stimulate an interneuron. 
Use the following structures and terms involved: a) neuron, b) axon, c) dendrite, d) axon terminal e) action potential f) neurotransmitter, g) synapse, …

How are enzymes manufactured? 
Study Enzyme Activity .

What are the functional similarities between vitamin A and vitamin C? 
Study Nutrition Vitamins - Easily Explained .

What is inhalation (breathing)? 
The diaphragm (exclusive of mammals) and the intercostal muscles can contract or relax varying the volume of the thorax (the compartment where the lungs …

What are the characteristics or features of AA genotype? 
I just discover that most people that possess AA genotype are easily affected with malaria. Study Blood Types Review .

What is an effector? 
Study Homeostasis .

How many times the ovum is larger than the sperm? 
Probably a thousand times. Read Gametogenesis .

What is homeostasis about? 
Study Homeostasis .

Can the retina interpret vision through pressure? 
I had vitrectomy procedure, I can see outline of gas bubble in complete darkness, where is light coming from to make a shadow? Read also: Eyes

A person with a prosthetic arm picks something up very hot. Why would their reaction time be slow? 
A person with a prosthetic arm picks something up very hot why would their reaction time be slow? Read also: Nervous System

Why sensitivity is important in organisms? 
Click on post comments to answer.

How differentiation forms four main tissues? 
epithelial tissue, muscle tissue, nerve tissue, connective tissue.

What is love? 
Good question.

Why thre is criss-cross of nerves in medulla oblongata due to which the right cerebral hemisphere control the left side of the body n left cerebral hmsphre cntrls the ryt side of the body . 
Why thre is criss-cross of nerves in medulla oblongata due to which the right cerebral hemisphere control the left side of the body n left cerebral hmsphre …

What is the first immunoglobulin that appears after artificial immunisation? 
Ig G or M? Click on post comments to answer. For studying more than 1800 Bioloqy questions correctly answered, download our ebook .

Does negative feedback in homeostasis has more importance than positive feedback? 
I don't really get these "negative and positive feedbacks".

Which ions perform functions like maintenance of equilibrium of ions and nerve impulse conditions and why? 
Sodium and potassium ions, magnesium and calcium ions are responsible for that but the reason I dont know.

What is the role of epidermis? 
Epidermis plays a protective role.

Identify the function/s of the following tissues in an artery wall: connective tissue, muscle tissue, neural tissue. 
I would like to have description of functions of neural tissue, muscle tissue and connective tissue in wall of the artery. Go to: http://www.biology-questions-and-answ …

What are the basic similarities in functions of the lungs and small intestines? 
What are the basic similarities in functions of the lungs and small intestines?

What is the difference betwen the human circulation and the animal circulation? 
it could be .. they're different in terms of the mixture of their blood..

Why hemoglobin is called ahydrogen atom of molecular biology? 
Why hemoglobin is called ahydrogen atom of molecular biology?

What are the articulating structures in a long bone?  
What parts of the long bone are articulating structures? So that make it moveable, and also maybe explain why they are articulating structures.

Why blood is red? 
Blood is red in color due to the presence of hemoglobin.

How does breathing takes place? 
Oxygen In , Carbon Dioxide Out

What are the functions of blood? 
Functions of blood are as follows: -It transports nutrients after digestion and absorption to each cell of the body -Waste from all parts of the body …

Why is blood such a specialized tissue? 
Why is blood such a specialized tissue?

How does the immune system act on microbes that have started to attack cells? 
Antibodies, which are made by the lymphocytes, attach to the invaders so that the other white blood cells can destroy them.

Who and when was epithelial tissue first discovered and classified as "epithelial"? 
I've tried everywhere online and the only answers I'm getting are where to find it in/on the body and when it's taught in med.

A person takes a high concentration of salt, after some time she starts vomiting why?  
i guess this question is related to hypertonic solution .... but i need a proper answer. Please help.

Why can not we make bones? 
I am not a biology student but just for knowledge I want to know when a person bone get breaks, why we put rod to join it why we cannot make same bones …

Describe the relationship between a negative feedback system and the maintenance of homeostasis. 
Describe the relationship between a negative feedback system and the maintenance of homeostasis.

Describe complications individuals with high blood pressure may face with respect to urine formation. 
Usually, not a lot, but if the blood pressure has been high and uncontrolled for a long time, it would injure the glomerulus in the nephrons of their kidneys. …

Bringing two narrow objects together at arms length with one eye closed is challenging. Explain why this is and how our nervous system compensates for this? 
It is more challenging because your vision can only see one side because the other eye isn’t opened. Your brain uses its surroundings to determine how …

What is the importance of the pituitary gland? 
What is the importance of the pituitary gland?

Why is the digestive system considered as a special enviroment?  
Why is the digestive enzyme considered a special enviroment?

How connective tissue act as support system in a vertebrate? 
Vertebrates have certain type of connective tissue which help them.

Describe possible hormone changes that may result from a pituitary tumor. 
I have found 2: hyposecretion and hydrosecretion.

Why thyroxine has a more prolonged duration of action compared with insulin? 
Why thyroxine has a more prolonged duration of action compared with insulin?

What are the systems that work associated to the excretory system? 
The main systems that work with the excretory system are the ciculatory and endocrine system.

What are squamous epithelium tissues? 
These cells are arranged in fine layer and form the outer surface of skin of organisms.

What is being done in the lung cappillaries of a terrestrial chordate? 
Note: Many answers are on our main review pages.

ВЛИЯНИЕ КРОВОПОТЕРИ НА ЭРИТРОИДНОУЮ СИСТЕМУ У БОЛЬНЫХ ГЕМОФИЛИЕЙ 
ОТЕЧАЕТ ВЫСОКИМ РЕТИКУЛОЦИТОЗОМ И ГИПОХРОМИЕЙ

Describe how cortisol and thyroxin are similar in effect? 
DESCRIBE HOW THE HORMONES CORTISOL AND THYROXIN ARE SIMILAR IN EFFECT.

Why are women carries of the haemophiliac trait but not haemophiliacs themselves? 
Why is there 50% chance that sons of carrier female will show the trait?

From which arteriole are the substances taken from during “tubular secretion”? 
From which arteriole are the substances taken from during “tubular secretion”?

What happens to pepsin when it enters the duodenum? 
I am not sure about the conditions of the duodenum and I am also unsure of the optimum pH and temperature for pepsin to work.

Why is the zygote called fertilized egg? 
Reproduction in organisms.

What role does the right atrium play in the circulatory system ?  
I don't know the answer but i think it has something to do with pumping blood.

Where are cell bodies of neurons of serotonin located? 
In what part of the brain is serotonin released? What are the synaptic targets?

What kind of energy is required to climb a ladder? 
What kind of energy is required to climb a ladder?

How is urea formed and excreted in mammalian body? 
How is urea formed and excreted in mammalian body?

What is short-sightedness and long-sightedness in humans? 
Describe the full eye structure and both the terms briefly. Then explain the changes in the muscles of eye in short and long sightedness.

How tissue function is related to the types of cells that make up the tissue? 
Tissue is a group or mass of similar cells working together to perform certain common functions.

What hormones are found in the thyroid? 
I dont know what it is.

Explain how the endocrine system impacts respiratory function? 
Epinephrine and norepinephrine dilate airways during exercise and other stresses. Erythropoietin regulates the amount of oxygen carried in the blood by …

What is immunological tolerance? 
The inability to initiate an immune response?

Which mechanisms provide variability for antibodies? 
Which mechanisms make the antibodies variable?

Why rapid growth of human being occur in winter? 
Rapid release of growth hormone?

How would I test a sample of urine for glucose? 
I am doing my biology gcse, and have been asked this question which I am stuck on, my aunt trying to help me, but think her answer is dated.

How is glucose transported to all the cells of the body? 
Click on post comments to answer.

Can you have no T cells in your body ? 
What would happen if you dont have any T cells? Click on post comments to answer.

What is meant by digestion? 
This is the breaking down of large molecules of food to smaller molecules for easy absorption. Click on post comments to answer.

How does the muscular system of vertebrates work? 
Click on post comments to answer.

What is a circulatory system? 
Click on post comments to answer.

How the homeostasis of blood is maintained? 
Homeostasis of blood is maintained by: 1)breaking down of glycogen in liver and muscles, when blood sugar level falls. 2)converting excess sugar …

How many organs are in humans? 
Click on post comments to answer.

What are the receptors of astringent taste? 
Click on post comments to answer. .

Which are the main cells of the nervous system? 
Click on post comments to answer.

Which statement is true about blood transfusion between two humans:  
a) A person with blood group A+ can give blood to a person with blood group A-. b) A person with blood group A+ can give blood to a person with blood …

What is homeostasis? 
A self regulating mechanism which seeks to maintain internal temperatures at a near constant for the proper fuctioning of cells. Click on post comments …

What two substances react together during respiration? 
Click on post comments to answer.

What is the biological phenomenon of the villus? 
Click on post comments to answer.

By observing the mammal cardiac stomach, mammal pyloric stomach and mammal duodenum explain how digestive enzymes work efficiently? 
What is the main role of liver in digestive system? Click on post comments to answer.

Question on Rh factor. 
What is the biological logic of administering anti-Rh antibodies to Rh- mothers immediately after they give birth to an Rh+ baby? Click on post comments …

What are macro vitamins? What are the examples of them? 
I am a caregiver student and one of my subject is nutrition. We are asked to submit a report on macrovitamins and examples of them... Can you reply me …

How breathing process takes place? 
The respiratory system is the anatomical system of an organism that introduces respiratory gases to the interior and performs gas exchange. In humans and …

Name the things that make up blood. 
1. Name the liquid part of blood. 2. What do red cell do? 3. What are phagocytes? 4. What are antibodies? 5. How do platelets help blood clot? …

Where are the T cells activated? 
My question is part of the lymphatic system. Click on post comments to answers.

What is digestion? 
Click on post comments to answer.

What is digestive system? 
What is digestive system?

What type of substance serves as a chemical signal and can be sent around the body? 
What type of substance is adrenaline, insulin and glucagon, as examples?

How does inspiration (breathing in) takes place in a mammal? 
I want to know the answer please. Thanks. Note: Read our Physiology reviews.

Are the lungs in direct contact with the external environment? 
Are human lungs in direct contact with the external environment? Do the lungs have any filters to prevent any food crumbs from being ingested?

What force is usually transmitted along the axis of the bone? 
Force usally transmitted along the axis of bone?

What are three external factors monitored by the nervous system? 
What are three internal factors monitored by the nervous system?

Filtration rate in the glomerulus is increased by? 
Filtration rate in the glomerulus is increased by...

What is a cell tissue versus a specialized cell? 
I believe cell tissue is made up of a group of specialized cells, whereas a specialized cell is a cell with a specific function.

If a single-cell organism is living in a hypotonic enviroment, how would it maintain homeostasis? 
If a single-cell organism is living in a hypotonic enviroment, how would it maintain homeostasis?

Does fear affect blood pressure? 
Does fear affect blood pressure? And how?

As the CO2 increases in the cells, what tissue takes the CO2 away from the cells? 
By what process does the CO2 get into that tissue? This tissue comes close to air in lungs. What process happens to the CO2 there? What direction …

Human eye (hypermetropia) 
It is said that a newly born child suffers from hypermetropia. As he grows up, his eyes become normal. I mean to say that when a child is born from the …

Why is transpiration such an important process in plants? 
I think is something related to water loss.

Graafian follicle is surrounded by what? 
Options are theca externa, theca interna or theca albuginea.

What's the relationship between the endocrine system and the immune system? 
I need help on understanding this question for a project.

Describe the process of acid secretion in the stomach. Include cell types, transporters, enzymes and substrates/products. 
The acid secreted by the stomach is generated inside parietal cells. The secretion of acid by parietal cells is stimulated by parasympathetic nervous activity, …

In what three ways does the formation of urea prevent intoxication? 
In what three ways does the formation of urea prevent poisoning?

Explain how collagen tissue is structured for its function. 
There are different collagen types. The main function of these proteins is to keep the shape and the structural rigidity of the tissue. (Collagen is the …

What is Belfour's law? 
It is something related to reproduction.

How red blood cells are not attacked by our immune system although they do not have MHC class I in their surface? 
How red blood cells are not attacked by our immune system although they do not have MHC class I in their surface?

What is the difference between male and female gametogenesis? 
Spermatogenesis makes sperm in the testes and oogenesis makes eggs in the ovaries, but there are some other differences.

Which statements apply to "food"? 
I really do no the answer help me.

What are the main differences between asexual and sexual reproduction? 
The main differences between "Asexual reproduction" and "Sexual Reproduction" is that: Asexual- There are no sex cells. Only one individual is involved …

How nerve cells multiply without centrioles? 
Cells in olfactory epithelium and hypothalamus do not have centrioles, how the multiply? (Don't they?)

Why gametogenesis results in female in two unequal sized elements? 
I am student in the Biology department and I have this question in embriology. Note: You may find answer on our Gametogenesis page.

What happens if two different species mate? 
Does it stop cell division in the zygote? If so, what happens to the zygote?

What is the role of relaxin hormone? 
HELPS IN REPRODUCTIVE SYSTEM...

What is the fuction of lymphatic nodes? 
What is the fuction of lymphatic nodes?



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