163.Which of the following is a metabolic function of the cells labeled
with arrows in the accompanying light micrograph?
258 Anatomy, Histology, and Cell Biology
a. Receptors for endothelin
b. Release of serotonin
c. Production of type III collagen
d. Synthesis of plasminogen activator
e. Production of thromboxane
164.You are working in a research laboratory studying cardiovascular
function. The studies in that laboratory use a “knockout” mouse in which
the gene for atrial natriuretic peptide (ANP) is deleted. Which of the fol-
lowing would you most likely find elevated?
a. ANP levels in the bloodstream
b. Excretion of urine
c. Excretion of sodium
d. Peripheral vasoconstriction
e. Capillary permeability