Which absorption mechanism is selective and uses adenosine triphosphate (ATP) energy??
A) Passive diffusion
B) Facilitated diffusion
C) Active transport
D) A and B
E) B and C
C
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Diarrhea is a symptom associated with _____ deficiency and a disease called _____.?
A) niacin, pellagra B) thiamin, beriberi C) vitamin C, scurvy D) vitamin D, rickets E) molybdenum, xerophthalmia
Caffeine ________.
A. reduces the ability of skeletal muscles to contract B. lowers blood fatty acid levels C. is a depressant drug D. is addictive
A scientist discovers a new chemical in the leaves of a rare tropical plant. When trying to determine the role of the chemical, the scientist determined that it is not a structural part of the plant's cells or a pigment that contributes to the color of the plant's leaves. She was able to learn that the chemical sped up a particular chemical reaction involving the plant's metabolism. Based on this information, the new chemical is a (an) ________.
A. solution B. ileum C. enzyme D. sphincter
The liver is the first stop for most absorbed nutrients because it
A) lies so close to the intestine. B) controls blood flow to the heart. C) is the end point for the portal vein. D) must respond by making the correct amount of insulin.