Speed of the Nerve Impulse (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Which factor is most significant in determining nerve impulse speed?
Which factor is most significant in determining nerve impulse speed?
Myelination
What is the primary function of the myelin sheath?
What is the primary function of the myelin sheath?
Acts as electrical insulator
What are nodes of Ranvier?
What are nodes of Ranvier?
Gaps between Schwann cells
What is saltatory conduction?
What is saltatory conduction?
Signal jumps between nodes
Where does depolarisation occur in myelinated neurones?
Where does depolarisation occur in myelinated neurones?
Only at nodes of Ranvier
Why do larger diameter axons conduct impulses faster?
Why do larger diameter axons conduct impulses faster?
Less resistance to current
Above what temperature do nerve proteins begin to denature?
Above what temperature do nerve proteins begin to denature?
40°C
What speed can saltatory conduction achieve in myelinated neurones?
What speed can saltatory conduction achieve in myelinated neurones?
Over 100 m/s
How does increased temperature affect nerve conduction up to 40°C?
How does increased temperature affect nerve conduction up to 40°C?
Increases speed
What condition involves damage to myelin sheaths?
What condition involves damage to myelin sheaths?
Multiple sclerosis