Unit 6 Nervous Coordination

Question 1

Explain how a resting potential is maintained across the axon membrane in a neurons

Answer 1

1. Higher concentration of potassium ions inside and lower outside or potassium ions diffuse out
2. Membranes more permeable to potassium ions
3. Sodium ions actively transported out and potassium ions in

Question 2

Explain why the speed of transmission of impulses is faster along a myelinatedaxon than along non-myelinated axons

Answer 2

1. Myelination provides insulation
2. Saltatory conduction and only depolarised at nodes
3. Non-myelinated depolarised occur along whole length of axon