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Summary AQA Nervous impulses and synaptic transmission $3.89   Add to cart

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Summary AQA Nervous impulses and synaptic transmission

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Summarised notes of nerve impulses and synaptic transmission (3.6.2.1 and 3.6.2.2) from unit 6 of AQA A-level biology (Organisms respond to changes in their internal and external environments) and revision checklist and exam tips.

Last document update: 3 year ago

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  • Topic 6b
  • June 23, 2020
  • June 24, 2020
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Available practice questions

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Some examples from this set of practice questions

1.

What is the resting potential of a neurone?

Answer: -70mv

2.

What is the function of dendrites in a neurone?

Answer: Carry impulses towards the cell body

3.

What is the function of the cell body in a neurone?

Answer: Contains the nucleus and most of the cell organelles

4.

What is the function of the axon in a neurone?

Answer: A single fibre that carries impulses away from the cell body

5.

What is the function of Schwann cells in the neurone?

Answer: Wrap around the axon insulating it

6.

What is the function of the nodes of Ranvier?

Answer: Gaps between the Schwann cells allow for ions to diffuse through

7.

What is the function of the synaptic knob in a neurone?

Answer: Contain neurotransmitter that is released to the target cell

8.

Why does it require energy to establish a resting potential?

Answer: The sodium-potassium pump requires ATP to transport Sodium ions and Potassium ions across the axon membrane.

9.

What is depolarisation?

Answer: The process of sodium ions entering the axon membrane raising the potential difference.

10.

What is repolarisation?

Answer: The process of potassium pumps opening and diffusing out of the axon membrane decreasing the potential difference.

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