Question

In a neuron, conversion of electrical signal to a chemical signal occurs at/in.

• A. Cell body
• B. Axonal end
• C. Dendritic end
• D. Axon

Answer 1

The correct option is B

Axonal end

The correct option is B.

Explanation of the correct option:

Option B:

1. The axonal end is responsible for secreting neurotransmitters into the synaptic cleft.
2. The axon terminal is a swollen structure (telodendron) that connects the Dendron or cell body of another neuron.
3. This connection establishes a synaptic connection.
4. The axons commonly make a connection with other neurons but can also connect to muscles or glands at the junctions known as synapses.
5. The axonal end of the presynaptic neuron releases the neurotransmitter into the synaptic cleft between pre and postsynaptic neurons.
6. The released neurotransmitters enter the dendrites of the postsynaptic neuron, which leads to the generation of a nerve impulse.
7. The generated electric nerve impulse is converted into the chemical charge at the synaptic cleft.
8. Hence, the conversion of the electrical signal to a chemical signal occurs at the junction between the axonal end and dendron head of another neuron.

Explanation of the incorrect options:

Option A:

1. Cell body forms the major core section of the neuron.
2. It contains the genetic information of the cell.
3. It maintains the neuron's structure and helps to provide energy for neuronal activities.

Option C:

1. Dendritic end's major function is to collect the neurotransmitters via the neurotransmitter receptors present on the neuron.
2. They are highly branched structures similar to the branches of a tree.
3. They help in the conduction of electrochemical charges to the cell body.

Option D:

1. The axon is a cable-like structure in the neuron which helps to transfer the electrical signal throughout the neuron to reach the other end.
2. It assists in carrying the nerve impulse.
3. The axon of a neuron is millimeters long, but the longest ones can stretch from the brain to down the spinal cord.
4. Axon connects one neuronal junction to another.

Final answer: In a neuron, conversion of the electrical signal to a chemical signal occurs at the Axonal end.