Which is characteristic of cardiac muscle tissue?
a. well developed sarcoplasmic reticulum.
b. fast myosin ATPase activity.
c. contraction is initiated neurogenically.
d. presence of gap junctions.
e. calcium supplied by sarcoplasmic reticulum exclusively.
D
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Which of the following would achieve the absorption of water across the epithelial lining toward the blood vessels of the small intestine?A) Active transport of Na+ from the lumen to the basolateral sideB) Facilitated diffusion of glucose to the bloodstream from the lumenC) Active transport of H+ from the basolateral side to the lumenD) Tightening the tight junctions between epithelial cellsE) Opening of aquaporins on the apical membrane
What will be an ideal response?
Thyroid hormone does not
a. increase metabolic rate b. increase tissue responsiveness to catecholamines c. increase absorption of iodine from the digestive tract into the blood d. promote normal growth e. promote normal development of the nervous system
The effects of aging on the skin include all of the following except:
A. loss of fat from the subcutaneous tissue B. thinner epidermis C. increases in sebaceous gland activity D. reduction in collagen and elastin
During the isovolumetric contraction period of the cardiac cycle,
A. AV and semilunar valves are closed. B. the atria are contracted. C. ventricular volume increases. D. blood is pumped into the large arteries. E. pressure in the ventricles decreases.