Which statement about nitric oxide is incorrect?
a. It increases the total peripheral resistance by its action on arteriolar smooth muscle.
b. It relaxes digestive tract smooth muscle.
c. It is the direct mediator of penile erection.
d. It is released as "chemical warfare" by macrophages of the immune system.
e. It serves as a novel type of neurotransmitter in the brain.
A
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Left ventricular pressure is higher than pressure in the aorta during
A) atrial systole and ventricular systole B) ventricular diastole only. C) ventricular systole only. D) atrial systole only. E) All of the answers are correct.
Tom loves to soak in hot tubs and whirlpools. One day at a friend's house, he decides to raise the temperature in the hot tub as high as he could tolerate. After a few minutes in the very warm water, he feels faint, passes out, and nearly drowns. Luckily, his friend saves him. Explain what happened physiologically.
What will be an ideal response?
The opposite of supination is ________.
A. inversion B. pronation C. flexion D. elevation E. protraction
A myofilament is the
A. cell membrane of a muscle fiber. B. cytoplasm of muscle cells. C. structural and functional unit of the skeletal muscle cell. D. contractile thread that extends the length of the muscle fiber. E. protein strand composed of actin or myosin.