The muscle cell's electrical response is turned off by an enzyme in the motor end-plate membrane, acetylcholinesterase (AChE), which inactivates ACh.
a. True
b. False
Indicate whether the statement is true or false
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Question 2) Which type of glial cell lines the ventricles of the brain?
a. astrocytes
b. neurons
c. oligodendrocytes
d. ependymal cells
e. microglia
(
Question 3) The motor end-plate region undergoes a threshold potential, so an action potential is initiated at this site.
a. True
b. False
Indicate whether the statement is true or false
(
Question 4) Which of the following is least associated with ependymal cells?
a. myelin sheath
b. brain ventricle
c. CSF
d. choroid plexus
e. glial cell
(
Question 5) The end-plate potential (EPP) is a graded potential similar to an EPSP, except that an EPP is much larger.
a. True
b. False
Indicate whether the statement is true or false
(
Question 6) Which of the following is not a function of astrocytes?
a. Hold neurons together in proper spatial relationship.
b. Line internal cavities of the brain and spinal cord.
c. Induce the formation of the blood-brain barrier.
d. Take up excess K+ to help maintain proper brain ECF ion concentration.
e. Form neural scar tissue.
(
Question 7) Nerve and muscle cells do not come into direct contact at a neuromuscular junction.
a. True
b. False
Indicate whether the statement is true or false
(
Question 8) Astrocytes
a. induce formation of the blood-brain barrier
b. are important in the repair of brain injuries and in neural scar formation
c. take up excess K+ from the brain ECF
d. physically support neurons
e. perform all of the above functions
(
Question 9) The specialized underlying portion of the muscle cell membrane is called the sensory end plate.
a. True
b. False
Indicate whether the statement is true or false
(
Question 10) The vast majority of cells in the nervous system are
a. fibroblasts
b. glial cells
c. neurons
d. plexus cells
e. sarcomeres
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