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