Merkel cells are pressure-sensitive cells found in which location?
a. Cochlea
b. Crista ampullaris
c. Epidermis
d. Muscle spindles
e. Reticular dermis of the skin
ANS: C
Merkel cells are specialized epithelial cells of the skin that respond to touch and pressure.
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Angiotensin II triggers
A. vasoconstriction and increased urine output from the kidneys. B. vasoconstriction and decreased urine output from the kidneys. C. vasodilation and increased urine output from the kidneys. D. vasodilation and decreased urine output from the kidneys.
Answer the following statements true (T) or false (F)
1. Cardiac veins empty into the superior vena cava, which drains into the right atrium. 2. One function of arteries is to serve as blood reservoirs. 3. In the capillaries, glucose and carbon dioxide move in opposite directions. 4. A heart that is beating weakly will cause a drop in the central venous pressure. 5. Normal average diastolic pressure is about 120 mm Hg.
Movement of K+ into the cell requires energy expenditure, whereas movement of Na+ into the cell does not
Indicate whether the statement is true or false
The cerebellum communicates with other parts of the CNS by means of nerve tracts called the
A. vermis. B. flocculonodular pathways. C. cerebellar peduncles. D. arbor vitae. E. folia.