Question

Which of the following statements about transmission of nerve impulse is correct?

• A. Nerve impulse travels from dendritic end towards axonal end
• B. At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron
• C. The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron
• D. A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells

Answer 1

Answer: (A), (C)

The correct options are
A Nerve impulse travels from dendritic end towards axonal end
C The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron

The transmission of nerve impulse is unidirectional. The nerve cells are connected to each other or a muscle cell or gland through a synapse. The neuron conducts information in the form of electric impulse that travels along the length of the axon, reaches the terminal end or the axonal end where it is converted into chemical signal, packed in vesicles. The vesicles release the chemical substances (example Acetylcholine) in the synapse. This chemical substance travels through the synaptic junction and reaches the receptors present on the dentrites of the subsequent neuron or a muscle cell or the gland where it is further converted to an electric impulse or response.

So, the correct options are A and C