Of the following muscle types, which one is usually under voluntary control?
A) skeletal muscle
B) cardiac muscle
C) smooth muscle
D) None of the above.
Ans: A) skeletal muscle
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Which of the skin layers below is the most superficial?
A) Papillary layer B) Epidermis C) Reticular layer D) Basal lamina E) Hypodermis
An increase in the permeability of the cells of the collecting tubule to water is due to a(n) ________
A) increase in the production of ADH B) decrease in the concentration of the blood plasma C) increase in the production of aldosterone D) decrease in the production of ADH
Canned pet food contains about 25% water
Indicate whether the statement is true or false
Urine is prevented from flowing back into the ureters from the bladder by ________.
A. the internal urethral sphincter B. the external urethral sphincter C. the ureteral sphincters D. compression of the ureteral openings E. ureteral valves