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What is the difference between arteries, veins and capillaries?

Arteries, veins and capillaries are all types of blood vessels. The best way to think about their differences are the roles they play in circulation. So, if we take the systemic circulation as an example (th...
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Answered by Elizabeth H. • Biology tutor
76571 Views

Which three things are present in plant and agal cells but not in animal cells? (3)

Cell wall Chloroplasts A permanent vacuole This is a common question. I like to remember it as CVC - Cats Vs Cucumbers - like all the YouTube videos of cats being scared by cucumbers.
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Answered by Chris R. • Biology tutor
3675 Views

Give an example of a negative feedback mechanism in the human body.

When the hypothalamus in the brain detects that the blood is getting too concentrated (not enough water), it stimulates the pituitary gland to release an anti-diuretic hormone (ADH). When it reaches the kidn...
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Answered by Paul M. • Biology tutor
7996 Views

Describe the difference between the function of a receptor and function of an effector; give an example of each.

Receptor: There are different types of receptors within the peripheral nervous system. There can be free nerve endings for pain and other types of receptors within the layers of the skin for sensations such ...
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Answered by Olivia H. • Biology tutor
14980 Views

What is nitrogen fixation?

Nitrogen fixation is one stage of the nitrogen cycle. The nitrogen cycle describes the different transformations of the forms of nitrogen in nature. The nitrogen cycle is important because plants need nitrog...
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Answered by Eleanor B. • Biology tutor
8722 Views