Bio 103 Chapter 11

All of the following are functions of the myelin sheath EXCEPT which one?

The myelin sheath plays an important role in synaptic transmission.

Oligodendrocytes are similar to Schwann cells in that they

are a type of neuroglial cell

The central nervous system is composed of which of the following?

brain and spinal cord

Axons branch into axon terminals, which have ________ located at the terminal ends.

bulbs

The left and right sides of the cerebrum are interconnected by which one of the following?

corpus callosum

The central nervous system is enclosed by membranes or meninges called the

dura mater, pia mater, arachnoid

The three main anatomical and functional divisions of the brain are the

forebrain, midbrain, hindbrain

From an evolutionary standpoint, which of the following structures is considered the oldest, most primitive division of the brain?

hindbrain

Which one of the following activities would be facilitated by the sympathetic nervous system?

increased blood pressure

Control of respiratory rate, heart rate, and blood pressure is integrated through the

medulla oblangata

Which component of the nervous system is divided into the somatic and autonomic divisions?

motor

Cells that provide direct protection and physical support to neurons are

neuroglial cells

During which one of the following phases of an action potential do the sodium channels close and potassium channels open, releasing potassium from the neuron?

repolarization

A neuron at rest has a charge difference across its cell membrane, with the interior of the cell negative relative to the exterior. This difference in charge across the plasma membrane is referred to as ________ potential.

resting

Which one of the following provides the central nervous system with information about the outside environment?

sensory division

Which one of the following establishes and maintains the resting potential?

sodium-potassium pump

Both voluntary and involuntary skeletal muscle movement are controlled through which one of the following divisions of the nervous system?

somatic division

Excitatory neurotransmitters encourage the generation of new electrical impulses by which one of the following?

stimulating depolarization of postsynaptic neurons

Which one of the following types of neurotransmitter functions as an inhibitory agent, typically suppressing the sensation of pain?

endorphins

Control of smooth muscle and internal organs is the role of the ________ division of the nervous system

autonomic