Which of the following is true of oral rehydration therapy?
A. The presence of glucose aids the intestinal absorption of Na+ and water.
B. It is used to treat severe diarrhea.
C. It saves more than a million small children per year.
D. All of the choices are correct.
Answer: D
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Birds have the emotions and intelligence of a:
a. teenager c. adult b. child d. senior citizen
The receptors that are stimulated when blood PO2 drops below 60 mm Hg are located in the
a. respiratory center of the brain. b. carotid and aortic bodies. c. tissue capillaries. d. two of these answers are correct. e. all of these answers.
Dilation of the ________ causes the lacunae to fill with blood and the penis to become erect.
A. helicine arteries B. internal pudendal (penile) arteries C. deep arteries D. dorsal arteries E. dorsal veins
Which statement is incorrect?
a. Juxtamedullary nephrons establish a vertical osmotic gradient in the medulla. b. NaCl pumps of the ascending limb of the loop of Henle can establish a 1,200 mOsm/liter difference between ascending and descending limbs at any given location. c. Countercurrent exchange allows the vasa recta to preserve the vertical osmotic gradient while supplying blood to the medullary tissue. d. Collecting tubules of all nephrons utilize the driving force of the vertical osmotic gradient to accomplish variable H2O reabsorption under the control of vasopressin. e. The filtrate is isotonic as it enters the loop of Henle, hypertonic at the tip of the loop of Henle, and hypotonic as it leaves the loop of Henle.