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Describe the structure and function of the myelin sheath?

The myelin sheath is a fatty substance which surrounds and insulates neuron axons (i.e. it does not allow potassium or sodium ions to pass through it), which allows fast propagation of action potentials alon...
EC
Answered by Emma C. • Biology tutor
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What is a synapse in the nervous system?

A synapse is a junction between two neurones where they meet. It is a very small gap which chemicals diffuse across so the signal can transmit to or from the CNS. would draw diagram to demonstrate this
MF
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Name two components of an animal cell, and briefly describe their role.

One component is the nucleus. This organelle contains the genetic information of the cell, in the form of DNA. Another component is the mitochondira. This is the site of respiration in the cell and therefore...
CN
Answered by Ceri N. • Biology tutor
6893 Views

Explain why Darwin was drawn as a monkey?

This rather strange question is an example of an actual exam problem taken from the 2017 AQA Biology Exam which threw a lot of students off. The question in itself, however, is a good starting point for talk...
HG
Answered by Harriet G. • Biology tutor
10338 Views

What role does gut flora play and how does it work?

Gut flora is an example of good bacteria within our bodies that we need to survive. The average human has around 1.5kg of glut flora in there gastro-intenstinal tract. The gastrointenstinal tract (GIT) consi...
EK
Answered by Ermira K. • Biology tutor
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