Answer the following statements true (T) or false (F)
1. The buffer system works because weak acids dissociate much less than do strong acids.
2. The end products of both aerobic and anaerobic catabolism of glucose can cause a drop in the blood pH.
3. Carbonic acid is a “fixed acid.”
4. Blood in the pulmonary artery has a higher pH than the blood in the pulmonary vein.
5. The kidneys can produce urine with a pH less than 5.
1. TRUE
2. TRUE
3. FALSE
4. FALSE
5. TRUE
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Which of the following vessels has the lowest blood pressure?
A) elastic arteries B) capillary beds C) inferior vena cava D) aorta
Which of the following is involved in autoregulation of the GFR?
a. A myogenic mechanism in which the afferent arteriole automatically constricts when it is stretched b. A tubuloglomerular feedback mechanism in which vasoactive chemicals released from the juxtaglomerular apparatus bring about afferent arteriolar vasoconstriction c. Sympathetically induced vasoconstriction of the afferent arterioles d. Both a and b e. None of the above
Which figure exhibits concentric contraction of the biceps brachii muscle?
a) A b) B c) C d) none of these choices
Which of the following structures does not help to increase the absorptive surface area of the small intestine?
a. villi b. plicae c. lacteal d. microvilli