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How does the kidney filter blood?

The kidney is able to filter blood as it is made up of about a million filtering units. These units are called nephrons which are assosiated with capillaries. The blood flows to the glomerulus, which is a fi...
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Answered by Alyssa C. • Biology tutor
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Explain the lock and key hypothesis of enzyme function

To start, it is important to have a clear understanding of what an enzyme is. An enzyme is a biological molecule which speeds up the rate of a reaction without being changed or used up in the process. Each e...
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Answered by Emma P. • Biology tutor
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Q: Give examples of how the human body maintains homeostasis when we exercise.

A: When we exercise the tissues of our body have an increased requirement for oxygen. The body facilitates this by increasing the respiratory and heart rate, thereby increasing the rate of gas exchange in th...
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Answered by Amy M. • Biology tutor
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Explain the process of synaptic transmission (6 marks).

When the action potential reaches the pre-synaptic knob, voltage gated Ca 2+ channels open which allows Ca 2+ into the pre-synaptic knob - This causes vesicles which contain neurotransmitter such as acetylch...
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Answered by Dominic H. • Biology tutor
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Contrast facilitated diffusion and active transport

Since the key word is contrast infomation about both facilitated diffusion and active transport is needed. Facilitated diffusion does not require ATP whereas active transport does require ATP Facilitated dif...
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Answered by Daniel S. • Biology tutor
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