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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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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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Describe The transmission of a nervous impulse across a neuromuscular junction.

When an action potential arrives at the pre-synaptic knob voltage-gated calcium ion channels open, allowing calcium ions to diffuse into the synaptic knob. The influx of calcium ions causes neurotransmitter ...
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Answered by Reuben A. • Biology tutor
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What are the key characteristics of cancer cells and how do they arise?

Cancer cells are continually dividing in an uncontrolled manner and have adapted mechanisms of avoiding cell death. They are also more mobile and are capable of spreading to different parts of the body to fo...
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Answered by Rhys O. • Biology tutor
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