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Define an organ

A group of similar tissues that work together to perform a particular function.
JJ
Answered by Jonathan J. • Biology tutor
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What changes happen in the chest to allow us to breath in and out?

Air always moves from an area of higher pressure to an area of lower pressure, an example of this is when there is a puncture in a tyre. The air in the tyre is at higher pressure than normal and so when the ...
BG
Answered by Benjamin G. • Biology tutor
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A man has a disease caused by a dominant allele. The mother has the disease but the father does not, explain how we know the man is heterozygous for this disease.

So first we must gather the informaton, the disease is caused by a dominant allele, we may call this 'D', the recessive could therefore be 'd'. The mother has the disease, but the father does not. Therefore ...
LC
Answered by Lucas C. • Biology tutor
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What is an enzyme?

An enzyme is a catalyst / which speeds up a reaction. It's a protein and/or it's specific (due to its active site)
PE
Answered by Precious E. • Biology tutor
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Using your knowledge of the Circulatory System, describe & explain how and why an increase in intensity of exercise leads to an increased heart rate.

Firstly we must understand what exercise does to the body and the Circulatory system. We know that muscles need ATP to contract, this is demanded much more during a more strenuous exercise. ATP is created du...
TD
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