79. The process by which a nerve impulse is produced when sodium travels into the nerve cell, making the cell less negative, is known as
Answer: B
Depolarization
Depolarization is the process by which a nerve impulse is produced when sodium ions enter the nerve cell, causing the interior of the cell to become less negative. This change in voltage across the cell membrane is critical for the generation of action potentials.
A) long-term potentiation
Long-term potentiation refers to the long-lasting enhancement in signal transmission between two neurons that results from their repeated stimulation. It is not directly related to the initial process of sodium influx that leads to depolarization.
B) depolarization
Depolarization accurately describes the process in which sodium ions flow into the nerve cell, causing a reduction in the negative charge within the cell. This is the essential mechanism that initiates the nerve impulse, making this option the correct choice.
C) myelinization
Myelinization is the process of forming a myelin sheath around the axons of neurons, which increases the speed of nerve impulse conduction. It does not involve the movement of sodium into the cell and is not related to the generation of a nerve impulse.
D) synaptic transmission
Synaptic transmission is the process through which neurotransmitters are released from one neuron and bind to receptors on another neuron. While it involves communication between neurons, it does not describe the mechanism of sodium influx that leads to depolarization.
E) neuromodulation
Neuromodulation refers to the process by which a given neuron uses neurotransmitters to regulate a variety of other neurons. This process does not specifically pertain to the sodium influx that triggers depolarization and the subsequent nerve impulse.
Conclusion
Depolarization is the correct answer because it specifically describes the process of sodium ions entering the nerve cell, resulting in a less negative internal environment and the generation of a nerve impulse. All other options relate to different physiological processes and do not accurately capture the mechanism of action described in the question.