The shape of skeletal muscle cells is described as
A. irregular.
B. spherical.
C. cylindrical.
D. biconcave.
E. columnar.
Answer: C
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Explain the function of sodium-potassium ion pumps
A) They generate ATP for the cell during the electron transport chain when hydrogen ions move in a process known as chemiosmosis. B) The sodium-potassium ion pump binds acetylcholine across the synaptic cleft to generate an action potential at the sarcolemma. C) The sodium-potassium ion pump allows facilitated diffusion of potassium during the repolarization of a muscle cell. D) The sodium-potassium ion pump allows facilitated diffusion of sodium during the depolarization of a muscle cell. E) The sodium-potassium ion pump maintains the resting membrane potential of a cell by exporting three sodium ions out in exchange for two potassium ions entering the cell.
The main way acetylcholine is cleared from a synapse is by
A. reuptake by the presynaptic cell. B. being engulfed by a supporting glial cell. C. uptake by the postsynaptic cell. D. degradation by an enzyme.
A muscle always contracts ________. This is known as the all-or-none response.
A. incompletely B. its full length C. completely D. None of the choices are correct.
There are five ________ vertebrae, seven ________ vertebrae, and twelve ________ vertebrae.
A. cervical; thoracic; lumbar B. lumbar; thoracic; cervical C. cervical; lumbar; thoracic D. lumbar; cervical; thoracic