Myocardial cells can generate action potentials spontaneously because they have
A) L-type Ca2+ channels.
B) permanently open channels for Na+ and K+.
C) a net influx of Na+.
D) prolonged Ca2+ influx.
E) unstable ion channels.
E) unstable ion channels.
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Which of the following hormones is directly controlled by the nervous system?
A. Oxytocin B. Cortisol C. Epinephrine D. Insulin
In liquid XYZ, you notice that light is scattered as it passes through. There is no precipitant in the bottom of the beaker, though it has been sitting for several days. What type of liquid is this?
A) solution B) suspension C) colloid D) mixture
When intestinal chyme is highly concentrated,
A. water moves by exocytosis from interstitial spaces into the stomach. B. water moves by osmosis into the lumen of the small intestine. C. water moves by endocytosis from intestinal lumen into interstitial spaces. D. water does not move. E. water moves by osmosis from the intestinal lumen into the blood.
________ law is called the law of partial pressure.
Fill in the blank(s) with the appropriate word(s).