Chapter 15. Nervous system

The part of the nervous system that controls smooth muscle, cardiac muscle, and glands is the

• a. somatic nervous system.

• b. autonomic nervous system.

• c. skeletal division.

• d. sensory division.

Tags

NGSS.HS-LS1-3

Motor neurons and interneurons are neurons.

• a. pseudo-unipolar

• b. bipolar

• c. multipolar

• d. afferent

Cells found in the choroid plexuses that secrete cerebrospinal fluid are

• a. astrocytes.

• b. microglia.

• c. ependymal cells.

• d. oligodendrocytes.

• e. Schwann cells.

Neuroglia that are phagocytic within the central nervous system are

• a. oligodendrocytes.

• b. microglia.

• c. ependymal cells.

• d. astrocytes.

• e. Schwann cells.

Action potentials are conducted more rapidly

• a. in small-diameter axons than in large-diameter axons.

• b. in unmyelinated axons than in myelinated axons.

• c. along axons that have nodes of Ranvier.

• d. All of these are correct.

Clusters of neuron cell bodies within the peripheral nervous system are

• a. ganglia.

• b. fasciculi.

• c. nuclei.

• d. laminae.

Gray matter contains primarily

• a. myelinated fibers.

• b. neuron cell bodies.

• c. Schwann cells.

• d. oligodendrocytes.

Concerning concentration differences across the plasma membrane, there is

• a. more K+ and Na+ outside the cell than inside.

• b. more K+ and Na+ inside the cell than outside.

• c. more K+ outside the cell than inside and more Na+ inside the cell than outside.

• d. more K+ inside the cell than outside and more Na+ outside the cell than inside.

Tags

NGSS.HS-LS1-3

Compared with the inside of the resting plasma membrane, the outside surface of the membrane is

• a. positively charged.

• b. electrically neutral.

• c. negatively charged.

• d. continuously reversing, so that it is positive one second and negative the next.

• e. negatively charged whenever the sodium-potassium pump is operating.

Leak ion channels

• a. open in response to small voltage changes.

• b. open when a chemical signal binds to its receptor.

• c. are responsible for the ion permeability of the resting plasma membrane.

• d. allow substances to move into the cell but not out.

• e. All of these are correct.