Speed of the Nerve Impulse (AQA A-Level Biology): Flashcards
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Saltatory conduction
Saltatory conduction
Impulse jumps between nodes of Ranvier in myelinated neurones
Cells forming myelin sheath in peripheral nervous system
Cells forming myelin sheath in peripheral nervous system
Schwann cells
Nodes of Ranvier
Nodes of Ranvier
Gaps between adjacent Schwann cells on axon
Function of myelin sheath
Function of myelin sheath
Electrical insulator preventing current leaking from axon
Effect of larger axon diameter on conduction speed
Effect of larger axon diameter on conduction speed
Faster conduction due to less resistance
How temperature affects nerve impulse speed
How temperature affects nerve impulse speed
Higher temp increases ion diffusion, speeding depolarisation
Temp. limit for nerve function before protein denaturation
Temp. limit for nerve function before protein denaturation
Approximately 40°C
Speed of saltatory conduction in myelinated axons
Speed of saltatory conduction in myelinated axons
Over 100 m/s
Speed of continuous conduction in non-myelinated axons
Speed of continuous conduction in non-myelinated axons
1-2 m/s
Most significant factor determining nerve impulse speed
Most significant factor determining nerve impulse speed
Myelination