The primary mechanism for exchange of substances across the capillary wall is
A) bulk flow.
B) vesicle transport.
C) active transport.
D) mediated transport.
E) diffusion.
Ans: E) diffusion.
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When people die from HIV infections, it is usually because they _____
A) have too many HIV particles in their lymphatic system, which causes it to shut down B) have too few T cells to adequately fight infection C) have too many T cells, and this overwhelms their immune systems D) divert too much energy toward replicating the virus
Recall that the pancreas helps to maintain normal blood glucose levels. What endocrine organ plays a role in stabilizing blood calcium levels? Select all correct choices
A. The pineal gland B. The posterior pituitary gland C. The adrenal cortex D. The parathyroid gland
In mature compact bone, osteocytes become isolated from one another by the extracellular matrix, making it impossible for them to communicate with each other
Indicate whether the statement is true or false
Two nutrient solutions are maintained at the same pH. Actively respiring mitochondria are isolated and placed into each of the two solutions. Oxygen gas is bubbled into one solution. The other solution is depleted of available oxygen. Which of the following best explains why ATP production is greater in the tube with oxygen than in the tube without oxygen?
(A) The rate of proton pumping across the inner mitochondrial membrane is lower in the sample without oxygen. (B) Electron transport is reduced in the absence of a plasma membrane. (C) In the absence of oxygen, oxidative phosphorylation produces more ATP than does fermentation. (D) In the presence of oxygen, glycolysis produces more ATP than in the absence of oxygen.