Question

In a nerve cell (neuron), the conversion of electrical signal to chemical signal occurs in/at:

• A. dendritic end
• B. cell body
• C. axon
• D. axonal end

Answer 1

The Correct Option is D

Explanation of Nerve Impulse Transmission:

Electrical to Chemical Signal Conversion:
The conversion of an electrical signal (nerve impulse) to a chemical signal occurs at the axonal end (or synaptic terminal) of a neuron. When an electrical impulse travels down the axon and reaches the synaptic terminal, it triggers the release of neurotransmitters. These neurotransmitters are chemical messengers that carry the signal across the synapse, which is the gap between two neurons, to the next neuron. This process is essential for the transmission of nerve impulses from one neuron to another.

Dendrites:
The dendrites are the branch-like structures at the beginning of the neuron that receive signals from other neurons or sensory receptors. They act as the "antennae" of the neuron, gathering electrical impulses from surrounding neurons or stimuli.

Cell Body (Soma):
The cell body, or soma, integrates the signals received from the dendrites. It contains the nucleus and is responsible for processing and generating the nerve impulse that will travel down the axon. It also performs the necessary metabolic functions to sustain the neuron.

Axon:
The axon is a long, slender projection that transmits electrical signals away from the cell body to the synaptic terminal. The axon plays a crucial role in carrying the nerve impulse over long distances to communicate with other neurons or muscles. At the axonal end, the electrical signal is converted into a chemical signal (as described above) to cross the synapse.

Conclusion:
Together, the dendrites, cell body, axon, and synaptic terminal work together to transmit and process signals within the nervous system. The electrical signals within the neuron are converted to chemical signals at the synapse, allowing communication between neurons and facilitating complex functions like thought, movement, and sensation.