Question

Which of the following statements about transmission of nerve impulse 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.

Explanation for correct option:

1. The nerve impulse gets passed from one neuron's axon to another's dendrite and from the dendrite to the axons of some other neuron via a synapse.
2. Neurotransmitters are released at the neuron's axonal end rather than the dendritic end.

Explanation for incorrect options:

Option A:

1. Nerve impulse travels from the dendritic end towards the axonal end, Dendrites arise from the cell body of neurons.
2. They are trained to detect chemical messages.

Option C:

The chemicals produced from one neuron's axonal end crosses the synapse and causes a comparable electric stimulation in another neuron's dendrite.

Option D:

1. Both brain and the spinal cord contain neurons.
2. They have special cells that send nerve signals to all other neurons and also muscle and gland cells.

Final answer: “At the dendritic end, the electrical differences across the membranes of neurons cause the passage of nerve signals from one end to the other” is the correct sentence regarding the transmission of nerve impulses.