Which layer of the GI tract is composed of areolar connective tissue that binds the mucosa to the muscularis?
a) Submucosa
b) Lamina propria
c) Epithelium
d) Serosa
e) None of these choices
a
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The complement system
a. consists of plasma proteins produced by the liver that circulate in the blood in inactive form b. is the primary mechanism activated by antibodies to kill foreign cells c. can be activated by antibodies and/or antigens d. is considered a nonspecific defense e. has all of the above characteristics
The muscle cell membrane is called the ________.
A) endomysium B) sarcolemma C) perimysium D) epimysium
Secretion of atrial natriuretic peptide
A) increases potassium excretion. B) increases sodium excretion. C) decreases sodium excretion. D) decreases potassium excretion.
Which one of the following is NOT true of cholesterol?
A) Cholesterol provides energy fuel for muscle contraction. B) Cholesterol serves as the structural basis of steroid hormones. C) Cholesterol serves as the structural basis of vitamin D. D) Cholesterol is a major building block of plasma membranes. E) Only about 15 percent of cholesterol comes from the diet.