In a negative feedback mechanism, ________
A) the output increases in response to the stimulus
B) the output opposes or counteracts the stimulus
C) the output multiplies the stimulus
D) the output increases exponentially in response to the stimulus
Answer: B
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Where does gas exchange occur within the lungs?
A) alveoli B) secondary bronchi C) bronchioles D) None of the listed responses is correct.
When deoxygenated blood leaves the right ventricle through a semilunar valve, it is forced into the __________.
a. pulmonary veins b. pulmonary arteries c. aortic arch d. lung capillaries
Which describes the action of a ligand's competitive antagonist?
A. It decreases the amount of ligand required to activate the protein. B. It blocks the binding of the ligand to its binding site and prevents activation of the protein. C. It binds to a different binding site on the protein, altering the protein shape so that a ligand cannot bind. D. When present, it increases the binding of a ligand to its receptor.
Azetazolamide (Diamox) is a diuretic. It functions by blocking the activity of carbonic anhydrase inside kidney tubule cells
This slows the formation of carbonic acid. By slowing the formation of hydrogen ions in the cells of the tubule, sodium reabsorption is also slowed. This results in the diuretic effect. Select from the following list the possible side-effects of Azetazolamide. (1) acidosis (2) reduced movement of bicarbonate ion into the plasma (3) an alkaline urine is produced (4) respiration increases A. 1, 4 B. 2, 3 C. 1, 2, 3 D. 2, 3, 4 E. 1, 2, 3, 4