True or False a Myelin increases the speed of action potenti

True or False?

a) Myelin increases the speed of action potential propagation partly by decreasing membrane capacitance.

b) Ca²⁺ influx is not important for the propagation of action potentials but can depolarize dendrites.

c) Axons with small diameters conduct action potentials more quickly because fewer ions need to enter membrane to achieve depolarization.

d) Action potentials propagate at the same speed in all types of neurons.

Solution

Answer

a) Myelin increases the speed of action potential propagation partly by decreasing membrane capacitance-True

b) Ca²⁺ influx is not important for the propagation of action potentials but can depolarize dendrites-False

c) Axons with small diameters conduct action potentials more quickly because fewer ions need to enter membrane to achieve depolarization-True

d) Action potentials propagate at the same speed in all types of neurons-True