Question

Transmission of a nerve impulse is bidirectional.

• A. Bidirectionsl
• B. Unidirectional

Answer 1

The correct option is B

Unidirectional

The transmission of a nerve impulse along a neuron from one end to the other occurs as a result of electrical changes across the membrane of the neuron. The membrane of an unstimulated neuron is polarized—that is, there is a difference in electrical charge between the outside and inside of the membrane. These charges move across the membrane due to an impulse and this movement is always unidirectional. Hence, the transmission of nerve impulse is always unidirectional.