Muscle cells are the only cell types that contain intracellular contractile proteins.
Indicate whether the statement is true or false
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Question 2) Bile consists of all of the following except:
a. lipase
b. alkaline fluid
c. bile salts
d. lecithin
e. bilirubin
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Question 3) Which of the following does not influence smooth muscle activity?
a. autonomic neurotransmitters
b. mechanical stretch
c. hormones
d. alpha motor neurons
e. local metabolites
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Question 4) Choleretics:
a. decreases bile secretion
b. includes bile salts which are the most potent
c. includes NE
d. is another term for bilirubin
e. none of the above
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Question 5) Which one of the following statements concerning cardiac muscle is incorrect
a. contains gap junctions.
b. is found only in the heart.
c. is self-excitable.
d. is striated with intercalated disks.
e. lacks tropomyosin.
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Question 6) The typical coloration of the feces is due to
a. bile salts.
b. undigested cellulose.
c. aqueous NaHCO3 secretion.
d. bilirubin.
e. disintegrated epithelial cells.
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Question 7) Which of the following statements concerning smooth muscle is incorrect?
a. smooth muscle can develop less tension per unit cross-sectional area compared to skeletal muscle.
b. smooth muscle can maintain tension with comparatively less ATP consumption than skeletal muscle.
c. smooth muscle lacks troponin and tropomyosin.
d. the range of lengths over which smooth muscle is able to develop near maximal tension is much greater than for skeletal muscle.
e. a hollow organ enclosed by smooth muscle accommodates variable volumes with little change in the pressure exerted on the contents.
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Question 8) Which of the following is the most important stimulus for contraction of the gallbladder?
a. CCK causes contraction of the gallbladder.
b. mechanical contraction of the small intestine causes bile to be forced out of the gallbladder.
c. sympathetic stimulation causes contraction of the gallbladder.
d. an increase in bile secretion by the liver causes contraction of the gallbladder.
e. bile salts cause contraction of the gallbladder.
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Question 9) Pacemaker activity
a. refers to spontaneous depolarizations of the membrane resulting from shifts in passive ionic fluxes accompanying automatic changes in channel permeability.
b. refers to spontaneous depolarizations of the membrane due to cyclical changes in Na+-K+ pump activity.
c. is characteristic of single-unit smooth muscle but not found in any other muscle type.
d. both (a) and (c) above.
e. both (b) and (c) above.
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Question 10) Which of the following are functions of aqueous NaHCO3 secreted by the pancreas into the duodenum?
a. neutralization of acidic gastric contents emptied into the duodenum.
b. prevention of irritation of the duodenal mucosa.
c. active digestion of fat molecules into fatty acids.
d. both (a) and (b) above.
e. all of these answers.
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