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What are the functions of cell membranes?

You can find two types of membranes in the cell: the plasma membrane (or cell surface membrane) that is surrounding the whole cell and intracellular membranes that are found within the cell surrounding the o...
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Answered by Akvile D. • Biology tutor
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Some patients suffer from high ventricular pressure. This causes fluid to build up outside the blood capillaries. Explain why? How does widening the blood vessels using drugs reduce blood pressure?

Blood pressure is the result of the force exerted by the blood against the arteries through which it flows.This is determined by various factors including the compliance of blood vessels, the presence of ath...
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Answered by Tom D. • Biology tutor
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Explain why the number of organisms decreases along the food chain.

Not all energy is transferred between different levels of the food chain due to not all the organisms being consumed, often not the entire organism is eaten either, leaving behind energy in the hair/fur, tee...
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Answered by James G. • Biology tutor
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In what way is a diseased coronary heart artery differ from a healthy one, and what are two ways to treat it?

A diseased coronary heart artery has fatty diposits (atheroma) that narrow the lumen, and block bloodflow. As the coronary arteries primarily serve to nourish the heart, this can weaken it and if it remains ...
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Answered by Christine M. • Biology tutor
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How is ATP produced in the light-dependent reaction of photosynthesis?

The production of ATP occurs through the process of photophosphorylation. When light energy hits the chlorophyll molecule, it is absorbed by photosystem I and photosystem II . This raises the energy levels o...
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Answered by Anna L. • Biology tutor
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