White Matter

question 49

Multiple Choice

White matter

• A) increases steadily throughout childhood and adolescence.
• B) consists mostly of neurons and synapses.
• C) begins to decline in middle childhood.
• D) contains fewer myelinated nerve fibers than does gray matter.

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Definitions:

Motor Neurons

Nerve cells that carry impulses from the spinal cord or brain to muscles and glands, facilitating motion and action.

Multipolar

A type of neuron that contains one axon and multiple dendrites, allowing for the transmission of nerve impulses to and from various connections.

Resting Membrane Potential

The electrical charge difference across the cell membrane when the cell is not actively transmitting signals, typically around -70mV for neurons.

Local Potential

Depolarization that is not propagated and that is graded or proportional to the strength of the stimulus.