What process describes how a signal travels from one end of a neuron to the other end?

A. Hormonal regulation
B. Muscle coordination
C. Membrane excitability
D. Neurotransmitter release

I'm pretty sure the answer is C but just want to be positive.

Correct.

The correct answer is C. Membrane excitability.

The process of how a signal travels from one end of a neuron to the other end is called membrane excitability. Neurons are specialized cells that transmit electrical signals called action potentials. When a neuron is at rest, it has a stable negative charge inside the cell compared to the outside. When a stimulus is received, it causes the membrane potential to change. This change in potential leads to the opening of voltage-gated ion channels, resulting in the flow of ions across the cell membrane and the generation of an action potential. This action potential then travels along the length of the neuron, allowing for the transmission of signals between different parts of the nervous system.

To determine the correct answer, let's analyze the options and understand how a signal travels from one end of a neuron to the other end.

A. Hormonal regulation: Hormones are chemical messengers that travel through the bloodstream to target cells. While hormones can affect neurons and their activity, they do not directly describe the process of a signal traveling along a neuron.

B. Muscle coordination: Muscle coordination refers to the synchronized contraction and relaxation of muscles, which is controlled by motor neurons. While motor neurons play a role in muscle coordination, this option does not specifically describe the process of a signal traveling within a neuron.

C. Membrane excitability: Membrane excitability is the key process that describes how a signal travels from one end of a neuron to the other. Neurons have a resting membrane potential, and when a stimulus is received, the membrane becomes depolarized, generating an action potential that travels along the neuron.

D. Neurotransmitter release: Neurotransmitter release occurs when action potentials reach the axon terminal of a neuron, causing vesicles to fuse with the membrane and release neurotransmitters into the synapse. While neurotransmitter release plays a crucial role in communication between neurons, it does not directly describe the process of a signal traveling within a single neuron.

Based on this analysis, the correct answer is indeed C. Membrane excitability is the process that allows signals to travel from one end of a neuron to the other end.