Exam 10: Nervous System I: Basic Structure and Function

Sheaths of ________ cells often enclose the larger axons outside of the brain and spinal cord.

Astrocytes structurally support neurons and also provide important signals and nutrients to neurons.

Nodes of Ranvier lie between neurons.

During the absolute refractory period, a stimulus of high intensity may trigger a nerve impulse.

Action potentials are related to impulses conducted along an axon in that

Muscles and glands that respond to nervous stimulation are called ________.

The most rapid conduction of an impulse along an axon occurs on a fiber that is

Which of the following neuroglia are not part of the CNS?

Organize the following list of nervous system elements by their classifications as CNS or PNS elements: oligodendrocytes, thermoreceptors (nerves that sense temperature), interneurons, satellite cells, brain, motor neurons.

An excitatory postsynaptic potential lasts for about

Several interneurons from the spinal cord lead into and interact with the dendrites of a single motor neuron in the leg to sum impulses from several different sensory sources. This phenomenon is called ________.

An impulse conducted along an axon consists of a wave of ________ ________ moving away from a point of stimulation.

Transmitting an impulse from one neuron to another involves a(n)

Masses of myelinated nerve fibers appear

A person is exposed to a drug that prevents vesicles from forming in neurons. Predict the effect this will have on nerve function.

A neuron receives a series of stimuli that increases the membrane permeability of Na⁺, but not enough to cause membrane potential to surpass -55mV. This neuron is said to be

An immune response that affects the myelin coating on axons throughout the spinal cord and brain, triggering inflammation and leaving scars, is

The neurotransmitter most likely produced when a person uses a drug that creates a sense of well-being is

An action potential is triggered if

Three general functions of the nervous system are