Select the correct answer. How do narcotics work in the body?
OA.
Heighten the user's sensitivity to light
OB.
Decrease the user's ability to sense or respond to pain
C.
Slow the user's reaction time
D.
Disrupt the user's respiratory system

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Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.