Orange juice is acidic. When people drink orange juice and the acid enters their blood, the extra hydrogen ions combine with ________, providing a helpful buffer.
A. bicarbonate
B. calcium
C. hemoglobin
D. hydrochloric acid
Answer: A
You might also like to view...
This figure shows a renal corpuscle. The two structures indicated by number 3 collectively form the
A. Vasa recta B. Juxtamedullary junction C. Corticomedullary junction D. Macula densa E. Juxtaglomerular apparatus
Salt balance in humans
a. depends primarily upon control of Na+ intake through salt hunger b. depends primarily upon control of Na+ output by the kidneys c. is poorly regulated d. depends upon Na+ secretion by the kidneys e. is not affected by aldosterone secretion
AV valves are best auscultated at the ________
A) 2nd intercostal space B) 3rd intercostal space C) 4th intercostal space D) 5th intercostal space
Why is the zone of overlap an important region of the sarcomere?
A) The zone of overlap is important because it is where actin filaments are anchored to and overlap nebulin proteins. B) The zone of overlap is important because it is where myosin filaments are anchored to and overlap titin proteins. C) The zone of overlap is important because it is where the myosin heads can interact with the thin filaments. D) The zone of overlap is important because it is where one sarcomere ends and another sarcomere begins. E) The zone of overlap is important because it is where the troponin proteins bind acetylcholine to generate an action potential that can cause muscle contraction to occur.