As with action potentials in other types of cells, the repolarization of cardiac muscle cells involves the
A. entrance of sodium through voltage-gated channels.
B. entrance of calcium through voltage-gated channels.
C. binding of ACh to ACh receptor.
D. exit of potassium through voltage-gated channels.
E. simultaneous closure of sodium channels and opening of calcium channels.
Answer: D
You might also like to view...
David, an aspiring baseball player, was struck on the left side of his face with a fastball pitch. He was not wearing a safety helmet. His zygomatic arch was crushed, as well as parts of the temporal bone. Following the accident and reconstructive surgery, he noted that his left lower eyelid was still drooping and the corner of his mouth sagged. What nerve damage did he sustain?
What will be an ideal response?
Which of the following molecules can move across the phospholipid bilayer by simple diffusion?
A) lipids B) steroids C) lipids and water D) water E) All of the answers are correct.
Actions of the biceps brachii muscle include
A) flexion of the shoulder. B) supination of the forearm. C) flexion of the elbow. D) All of the answers are correct. E) None of the answers are correct.
The suffix for treatment with chemical substances or drugs is:
A) -scopy B) -therapy C) -graph D) -graphy