The external genitalia of the fetus can be distinguished as male or female by about ___
weeks after fertilization.
A) 6 B) 12 C) 24 D) 3
B
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The MOST effective way for the paramedic to minimize further injury in a patient with a spinal injury is:
A) prompt transport of the patient to a trauma center. B) rapid administration of corticosteroid medications. C) aggressive administration of IV crystalloid solutions. D) spinal motion restriction and prevention of heat loss.
Which of the following is NOT true of reactive astrocytosis?
A. injury site is blocked off B. scars limit regeneration C. causes the spread of inflammation D. reduces injury to surrounding tissue
The structures responsible for distributing excitation to the contractile cells are
A) contractile cells. B) conducting cells. C) intercalated cells. D) pacemaker cells. E) intermodal cells.
Which of the following factors is most important in matching the blood flow through a specific tissue with the metabolic needs of that tissue?
a. sympathetically induced vasoconstriction of the arteries supplying a tissue forces more blood to flow into the tissue. b. parasympathetically induced vasodilation of the capillaries within a tissue allows more blood to flow into the tissue. c. local changes within a tissue resulting from increased metabolic activity can produce local arteriolar vasodilation to allow more blood to flow into the tissue. d. widespread venous vasoconstriction allows blood to dam up at the tissue level. e. the amount of blood flowing through each tissue remains constant through reflex controls to ensure that metabolic needs are continuously met.