BIOL 100 Quiz 11

C

During repolarization of a neuron, A. the membrane potential is eliminated. B. potassium channels close, preventing further loss of positive ions. C. sodium channels close and potassium rushes out of the cell to temporarily re-establish the membrane potential. D. the sodium-potassium pump is turned off.

Ca2+, neurotransmitter

During this process, influx of ________ cause(s) vesicles in the axon bulb to fuse with the cell membrane, releasing ________.

the brain and spinal cord

The central nervous system is composed of

depolarization

The influx of sodium causes a decrease in the polarity of the cell and is called:

corpus callosum

The left and right sides of the cerebrum are interconnected by the

sodium-potassium pump

The levels of ions inside and outside of the cell are maintained by the:

cerebral cortex

The primary somatosensory and motor arease are found in the:

dendrite

The receiving end of neurons is called the:

A

Which of the following occurs during the absolute refractory period? A. The neuron cannot generate an action potential. B. Sodium channels open, releasing sodium ions into the neuron; potassium channels close. C. Sodium and potassium channels open. D. A nerve impulse is propagated.

bulbs

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

neuroglial cells

Cells that provide direct protection and physical support to neurons are

interneurons

Electrical impulses are transmitted between components of the central nervous system via

b

Oligodendrocytes are similar to Schwann cells in that they A. are located in the central nervous system. B. are a type of neuroglial cell. C. are located in the peripheral nervous system. D. help neurons regenerate after injury.

cerebellum

Region of brain that coordinates antagonistic muscle movements.

somatic

The _______nervous system controls the skeletal muscles.