Chapter 11 MASTERING BIO

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

Motor

Which one of the following cells transmits impulses away from the central nervous system to the muscles and other organs?

Motor neurons

transmit impulses away from the central nervous system

Motor neurons

Only 20% of cells in the human nervous system are neurons, and the rest are cells that support and protect neurons called ________ cells.

Neurological

Cells that provide direct protection and physical support to neurons are

Neurological cells

voltage threshold for membrane

(A) The Plateau in the beginning

the membrane is depolarized

(B) The top/highest point

potassium channels within the membrane are open

(C) Downward slope

the membrane has repolarized

(D) the lowest point

Amyotrophic lateral sclerosis (ALS) is a demyelinating disease that results from nerve damage beginning in the

Spinal Cord

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

During synaptic transmission, the influx of ________ causes vesicles in the axon bulb to fuse with the cell membrane, releasing ________.

Ca2+, neurotransmitter

Which one of the following events associated with the transmission of an impulse across a synapse occurs last?

Chemically gated channels for sodium open.

Electrical impulses are transmitted between components of the central nervous system via which one of the following?

Interneurons

transmit impulses within the central nervous system

Interneurons

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

Sensory division

transmit impulses toward the central nervous system

Sensory neurons

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

The myelin sheath plays an important role in synaptic transmission.

Saltatory conduction is

the process of conduction leaping along myelinated neurons