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John begins to exercise and his heart rate increases - explain how and why his heart rate increases

His heart rate increases as his cellular demand for oxygen increases and the amount of carbon dioxide in his blood increases, this is due to an increase in the rate respiration because of increased ATP deman...
SM
Answered by Sian M. • Biology tutor
3533 Views

During exercise changes happen at the skin involving blood vessels and sweat glands, describe these changes.

During exercise body temperatures increase, as this can be damaging to biological processes (enzymes may be denatured) the body tries to maintain a constant body temperature in a process called homeostasis. ...
AC
Answered by Adam C. • Biology tutor
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Enzymes are proteins. Antarctic fish may have different structure of enzymes to non-antarctic fish. Explain how their enzyme structure may be different.

Enzymes would have different sequence of amino acids and therefore different primary structure. This would result in different shape of a protein ie their tertiary or, if present, quaternary structure.
DR
Answered by Daria R. • Biology tutor
6377 Views

Describe how the small intestine is adapted for the absorption of nutrients

The small intestine has several adaptations to facilitate the absorption of nutrients: a short diffusion distance (single layer of epithelium) to maximise absorption, a good blood supply to rapidly transport...
TC
Answered by Tashi C. • Biology tutor
5284 Views

How is ATP generated via the electron transport chain?

Electrons travel down the electron transport chain via electron carriers at successively lower energy levels. This causes protons to be pumped into the intermembranal space, establishing an electrochemical p...
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Answered by Leo C. • Biology tutor
3270 Views