An action potential in the nerve fibre is produced when positive and negative charges on outside and the inside of the axon membrane are reversed because |
|
a) |
More potassium ions enter the axon as compared to sodium ions leaving it |
b) |
More sodium ions enter the axon as compared to potassium ions leaving it |
c) |
All potassium ions leave the axon |
d) |
All sodium ions enter the axon |
An action potential in the nerve fibre is produced when positive and negative charges on outside and the inside of the axon membrane are reversed because |
|
a) |
More potassium ions enter the axon as compared to sodium ions leaving it |
b) |
More sodium ions enter the axon as compared to potassium ions leaving it |
c) |
All potassium ions leave the axon |
d) |
All sodium ions enter the axon |
(b)
When a nerve fibre is stimulated, its membrane becomes more permeable to sodium ions, hence, more sodium ions enter the axon than potassium ions leaving it. As a result, the positive and negative charges on the outside and inside of the membrane are reversed. The membrane with reversed polarity is called depolarized.