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Describe and explain how an action potential is generated

This is a common question, that takes a little while to get your head around. Once you've understood the process, it can be simplified down to a cycle of 3 steps for memory: depolarisation , repolarisation a...
DS
Answered by Diluxshan S. • Biology tutor
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Describe and explain the adaptions of the human alveoli in making gas exchange efficient

Gas exchange can be made efficient in three main ways: shortening the diffusion distance, increasing the diffusion speed and increasing the surface area of the diffusion surface. The alveoli in the human lun...
EG
Answered by Eloise G. • Biology tutor
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Why does the enzyme Maltase catalyse only the hydrolysis of maltose.

The active site of the enzyme has a specific tertiary structure . The active site is complementary to the substrate maltose. Therefore only maltose may bind to the enzyme to form an enzyme-substrate complex.
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Answered by Keegan S. • Biology tutor
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How does an endotherm respond to a decrease in external temperature?

What's an endotherm? An animal that can increase its body temperature by metabolically produced heat. Why does a decrease in temperature matter? 37ºC is the optimal temperature for enzyme function – endother...
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Answered by Felix B. • Biology tutor
8411 Views

How are nerve impulses transmitted across a synapse?

Nerve impulses travel in one direction from the pre-synaptic to the post-synaptic neuron across a gap called a synapse. This is done to continue a nerve impulse so that it can reach its destination in the bo...
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Answered by Elizabeth H. • Biology tutor
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