Consider a basketball player whose heart is racing during the final moments of a game. with seconds on the clock, she makes a jump shot. her excitement is a function of her nervous system, and her movements are a function of her nervous system.
a. parasympathetic; sympatheticb. sympathetic; parasympatheticc. somatic; sympatheticd. sympathetic; somatic

Which blood cell spend most of their time in the lymphatic system?

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?

Tides that occur during the new and full moons