Question

Which of the following statements about the transmission of nerve impulses is incorrect?

• 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

The correct option is 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.

The correct option is B.

The explanation of the correct option:

1. The neurons have dendrites extending from the cell body essential as they receive chemical signals.
2. The release of chemicals or neurotransmitters is at the axonal end and not on the dendritic end.

The explanation of the incorrect options :

Option A:

1. The nerve impulses are being brought to CNS by the sensory neurons.
2. The nerve impulse's transmission is by the axon of one neuron to the dendrite of another.
3. Then dendrite to the axon of another neuron through the synapse.

Option C:

Telodendrites (by the axons) in synapses secreting neurotransmitters help the impulses to transmit to the dendrons.

Option D:

1. A nerve cell not only transmits electrical impulses to another neuron but also transmits to muscle and gland cells.
2. The sensory neurons are involved in taste, smell, hearing, seeing, and feeling. The motor neurons help in the movement of both voluntary and involuntary.

Final Answer: The incorrect statement is 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.