The critical tissue for producing a vasodilatory effect of acetylcholine in Robert Furchgott's experiments with rabbit aortas was the
A. endothelium.
B. smooth muscle layer.
C. elastic outer layer.
D. pericardium.
E. one-way valves.
A. endothelium.
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You’ve been diagnosed with anemia, a disorder characterized by a shortage of red blood cells. The doctor prescribes iron pills to help with your condition. Why?
a. Since the shortage could be caused by an unclotted bleed, the iron will aid in production of platelets which help with clotting. b. The red blood cell deficiency could be due to an active infection and iron helps white blood cells produce antibodies against certain antigens. c. Often anemia is a product of iron-deficiency which results in slower production of hemoglobin which is needed to produce red blood cells. d. This deficiency is likely due to heavy menstruation and iron will alleviate cramps and shorten the duration of the menstrual period.
What function do estuaries play in commercial fisheries? a. They provide mating grounds
b. They provide temporary shelter for adults. c. None of these choices. d. They serve as a nursery to juveniles.
Which nucleotide forms the tail of a completed
messenger RNA transcript?
a. adenine b. thymine c. cytosine d. guanine e. a combination of more than one of these
After secreting antibodies during an immune response, plasma cells then differentiate into memory cells.
Answer the following statement true (T) or false (F)