Which of these statements about ion movement through the plasma membrane is true?
A) Movement of Na+ out of the cell requires energy (ATP).
B) When Ca2+ binds to proteins in ion channels, the diffusion of Na+ into the cell is inhibited.
C) There are specific ion channels that regulate the diffusion of Na+ through the plasma membrane.
D) All of the above.
Answer: D) All of the above.
You might also like to view...
Gradual drifting of membrane potential toward threshold in autorhythmic cells is termed a
A) receptor potential. B) pacemaker potential. C) gated potential. D) ligand-gated potential. E) action potential.
The prostate gland
a. secretes an alkaline solution that neutralizes the acidic vaginal secretions b. secretes mucus for lubrication c. provides a site for final maturation for fertility and motility for the spermatozoa d. contains portions of the ductus deferens e. supplies fructose utilized by the sperm for energy
Increased activity in the cells of the ventral respiratory group of the medullary respiratory center is expected to produce
A. increases in the contraction of the external intercostals muscles. B. increases in the contraction of the internal intercostals muscles. C. increased contraction of the abdominal muscles. D. All of these changes. E. no change in breathing whatever.
A spinal cord injury occurs to the posterior spinocerebellar tract on the right side. What deficits would be expected?
A. Decreased sensory impulses to the cerebellum on the right side B. Decreased sensory impulses from the cerebellum on the right side C. Decreased sensory impulses from the cerebellum on the left side D. Decreased sensory impulses to the both sides of the cerebellum