When someone hyperventilates, what is happening with his or her carbon dioxide?
A) Carbon dioxide is exhaled more rapidly, decreasing blood CO2 levels.
B) Carbon dioxide in conserved in the blood as oxygen is refreshed in the lungs.
C) Carbon dioxide is exhaled more rapidly; blood CO2 levels remain constant or slightly increase.
D) Carbon dioxide is unaffected; rather, blood oxygen levels are increased.
Answer: A
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Glycolysis
a. produces citric acid b. transfers energy to glucose c. produces more ATP molecules than does one turn of the Krebs cycle d. traps energy in FADH2 e. does not perform any of the functions listed above
Which of the following is not part of the choroid layer?
a. iris b. cornea c. ciliary muscle d. all of the above are part of the choroid layer
In an isotonic, concentric contraction,
a. circular muscles (like those in the iris of the eye) contract, making a smaller aperture. b. muscle length shortens while tension remains constant. c. muscle lengths shorten, drawing objects closer to the body midline. d. None of these.
A 58-year-old woman with a history of hypercholesterolemia came to the ER with severe abdominal pain, nausea, and vomiting. She is diagnosed with advanced atherosclerosis after radiologic imaging reveals atherosclerotic plaque narrowing the blood vessel supplying the embryonic foregut and its derivatives. What blood vessel is most likely affected?
(A) Celiac artery (B) Superior mesenteric artery (C) Inferior mesenteric artery (D) Portal vein (E) Umbilical vein