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Why do nerve impulses travel faster in myelinated neurons?

The myelin sheath is a fatty layer made up of the hugely expanded plasma membrane of schwann cells which surround the axon of neurons. The axon is unprotected where the sheath of one cell meets the next and ...
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Answered by Hannah T. • Biology tutor
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What is the difference beween biological species concept and the phylogentic approach to defining species?

The biological species concept classifies species as a group of actually or potentially interbreeding individuals. This means that any two individuals (well a male and female) within the group could breed an...
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Answered by Harriet H. • Biology tutor
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What is the difference between an endocrine and exocrine gland?

An endocrine gland secretes its products, for example hormones, directly into the blood. An example of an endocrine gland is the adrenal gland which secretes adenaline made in the adrenal medulla directly in...
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Answered by Maddalena C. • Biology tutor
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How does a plant respond to light?

Plants have cells within them called photoreceptors. These receptors are light sensitive and the plant can detect the strength and direction of light, which is important for photosynthesis. The mechanism of ...
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Answered by Isabel K. • Biology tutor
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What are the different stages of mitosis and what do they consist of?

Mitosis can be grouped into four main stages: prophase, metaphase, anaphase and telophase. Prophase: the chromosomes supercondense, the nuclear envelope disintegrates and the centrioles migrate to the poles ...
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Answered by Harry J. • Biology tutor
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