Which is NOT true regarding antibodies?
A. They are secreted by plasma cells.
B. They protect against viruses by binding to them and presenting them to phagocytes.
C. They protect against viruses by binding to them and neutralizing them.
D. They activate complement.
E. They are the main mediators of the innate immune response.
E
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A human cell that has 69 chromosomes is
A. aneuploid. B. triploid. C. euploid. D. diploid.
An embryonic septum that develops within the bulbus cordis and truncus arteriosus produces what structures?
A. The right and left atria B. The right atrium and right ventricle C. The ascending aorta and pulmonary trunk D. The right and left ventricles E. The left atrium and left ventricle
Which statement is incorrect?
a. When [H+] increases, the kidneys conserve HCO3- by reabsorbing more HCO3- and reducing its excretion in the urine. b. When [H+] increases, the kidneys secrete more H+ to be eliminated in the urine. c. When [H+] increases, the kidneys secrete more basic phosphate to buffer the H+ in the tubular filtrate. d. When [H+] decreases, the kidneys excrete more HCO3- into the urine. e. When severe acidosis is present, the kidney tubules secrete NH3.
Standing still in an elevator that suddenly lowers stimulates receptors in the:
A) spiral organ (organ of Corti). B) bony labyrinth. C) utricle and saccule. D) basilar membrane.