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What is a cytoskeleton? What are its main components in animal cells?

A cytoskeleton is a structure that acts as a support for the cell. It also maintains the cell shape, holds and moves organelles. It is made from a fibre network dispered in the cell cytoplasm, attached in th...
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Answered by Bethany H. • Biology tutor
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How does the body bring blood glucose concentration from a high level back to normal?

When blood glucose concentration rises above its optimum level of 90mg/100cm 3 , it is detected by β-cells in the Islets of Langerhans in the pancreas. These β-cells release insulin into the bloodstream. Ins...
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Answered by Emily H. • Biology tutor
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What cells produce glucagon?

Alpha cells in the islets of Langerhans (pancreas)
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Answered by Lavin A. • Biology tutor
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Why do foetuses have different haemoglobin to adults?

Normal adult haemoglobin is primarily comprised of 2 alpha and 2 beta subunits and foetal haemoglobin has 2 gamma subunits instead of the 2 betas. Now what this does is increase the binding affinity of this ...
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Answered by Max B. • Biology tutor
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What is saltatory conduction?

Motor neurones have a myelin sheath made of Shwann cells. It's an electrical insulator meaning action potentials cannot pass through them. Along the axon there are gaps where there's no myelin sheath, called...
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Answered by Emily B. • Biology tutor
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