Chapter 10 True/False

A mixed nerve includes different neuroglial cells.

FALSE

A nerve is a single neuron that transmits nerve impulses.

FALSE

Converging nerve fibers amplify nerve impulses.

FALSE

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

FALSE

Interneurons are specialized to carry impulses from receptor cells into the brain or spinal cord.

FALSE

Myelin is composed largely of carbohydrates.

FALSE

Neuroglia are specialized to react to environmental change, and neurons support neuroglia.

FALSE

Nodes of Ranvier lie between neurons.

FALSE

Schwann cells produce layers of membrane containing myelin, which provides nutrition for the dentrites.

FALSE

Sensory nerve cells act as the decision-making cells to sum up all signals for certain stimuli.

FALSE

Sensory receptors are part of the CNS.

FALSE

Several nerve fibers converging onto one nerve fiber amplifies nerve impulses.

FALSE

The space between neurons is called the neuronal space.

FALSE

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

TRUE

Axon branches are called collaterals.

TRUE

Because the response of a nerve fiber is all-or-none, a greater intensity of stimulus does not produce a stronger impulse.

TRUE

Enkephalins are neuropeptides.

TRUE

In convergence, two or more incoming fibers contact a single neuron, whereas in divergence, impulses leaving a neuron pass into several output fibers.

TRUE

The brain and spinal cord comprise the central nervous system.

TRUE

The peripheral nervous system PNS lies outside the central nervous system CNS.

TRUE

The somatic nervous system controls voluntary actions and the autonomic nervous system oversees involuntary actions.

TRUE