Which of the following structures is continuous with the inner lining of blood vessels?
a. the pectinate muscles
b. the pericardial sac
c. the epicardium
d. the endocardium
Answer: d. the endocardium
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Which muscle(s) is (are) contracted to exhale forcibly?
A) diaphragm alone B) external intercostals and diaphragm C) internal intercostals and rectus abdominus D) rectus abdominis and diaphragm
Which of the following is (are) a mineralocorticoid?
A) thyroxine B) ADH C) cortisol D) androgens E) aldosterone
The "lub-dup" heart sounds are produced by:
A. the walls of the atria and ventricles slapping together during a contraction. B. the blood hitting the walls of the ventricles and arteries, respectively. C. the closing of the atrioventricular valves ("lub") and the closing of the semilunar valves ("dup"). D. the closing of the semilunar valves ("lub") and the closing of the atrioventricular valves ("dup").
________ cells are undifferentiated cells that undergo mitosis and give rise to keratinocytes.
Fill in the blank(s) with the appropriate word(s).