Biology STAAR (State of Texas Assessments of Academic Readiness) Practice Test

The primary function of a neuron is to transmit nerve impulses. Neurons are specialized cells in the nervous system responsible for carrying signals throughout the body. They communicate with each other and with other types of cells, allowing for the coordination of functions such as movement, sensation, and reflexes.

Neurons consist of a cell body, dendrites, and an axon. Dendrites receive incoming signals, while the axon transmits these signals away from the cell body to other neurons, muscles, or glands. This process is vital for the overall functioning of the nervous system, allowing for rapid communication and response to various stimuli.

In contrast, absorbing nutrients is a function associated more with cells in the digestive system, facilitating muscle contractions relates primarily to muscle cells, and supporting the immune system pertains to cells like lymphocytes. These roles are important within their own systems but do not define the function of neurons.