The following are true about an action potential in a nerve fibre:
a. it occurs when its membrane potential is hyperpolarized
b. it is associated with a transient increase in membrane permeability to sodium
c. there is a decreased in membrane permeability to potassium
d. it has an amplitude which varies directly to the strength of stimulus
a. it occurs when its membrane potential is hyperpolarized
b. it is associated with a transient increase in membrane permeability to sodium
c. there is a decreased in membrane permeability to potassium
d. it has an amplitude which varies directly to the strength of stimulus