Angiotensin-converting enzyme is mostly present in the capillaries of the ________.
A. lungs
B. liver
C. kidneys
D. adrenal medulla
Answer: A
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The most abundant proteins in blood plasma are
A) globulins. B) transport proteins. C) albumins. D) lipoproteins. E) fibrinogens.
The movement of which two ions is responsible for maintaining the plateau phase of the action potential of contractile cardiac muscle cells?
a. Na+ and Cl- b. Na+ and K+ c. K+ and Cl- d. Ca2+ and Na+ e. Ca2+ and K+
Which of the following statements applies to the ileocecal sphincter?
A. Peristaltic contractions reaching this sphincter cause it to relax. B. Closure of this sphincter inhibits absorption in the small intestine. C. This sphincter is usually relaxed. D. Cecal distention enhances relaxation of this sphincter. E. This sphincter stays contracted.
Bone heals well after injury while cartilage does not. This can be attributed to the fact that ________
A) the cells of cartilage and bone are enclosed in small cavities called lacunae B) bone is avascular and cartilage is highly vascular C) the matrix of bone is solid while the matrix on cartilage is semisolid D) bone is highly vascular and cartilage is avascular