The molecular event that occurs immediately after the power stroke is the
A) binding of actin to the myosin.
B) hydrolysis of ATP by the myosin head.
C) release of actin from the myosin head.
D) binding of tropomyosin to the myosin.
E) release of ADP from the myosin.
E) release of ADP from the myosin.
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Regarding the tonicity and osmolarity of solutions, which of the following statements is not true?
A. Hypoosmotic solutions are always hypotonic. B. Isotonic solutions are always isoosmotic. C. The term "tonicity" refers to the effect that a solution has on the degree of stretch or shrinking of the cell membrane. D. Hypertonic solutions are always hyperosmotic. E. The term "osmolarity" refers to the osmotic properties of a solution, regardless of its tonicity.
Menstruation is the process of sloughing off the old functional layer of the
A) perimetrium. B) endometrium. C) epimetrium. D) myometrium. E) exometrium.
The enteric plexus is composed of the ________ and the ________.
A. submucosal plexus; colonic plexus B. submucosal plexus; myenteric plexus C. colonic plexus; pancreatic plexus D. submucosal plexus; pancreatic portal E. myenteric plexus; pancreatic portal
In the arterial disease atherosclerosis,
A) blood flow through affected arteries slows. B) risk of a thrombus or embolus forming increases. C) all of the above may happen. D) plaque accumulates on the interior walls of arteries.