The heart's ability to vary stroke volume based solely on changes in end-diastolic volume is based on what mechanism?

a. Automaticity
b. Autoregulation
c. Bohr equation
d. Frank-Starling's law

ANS: D
The heart's ability to change stroke volume solely according to the EDV is an intrinsic regulatory mechanism based on the Frank-Starling's law.

Health Professions

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The principal mediator of an allergic reaction is:

a. Hymenoptera b. Injected penicillin c. Delayed hypersensitivity d. Histamine

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Which one of the following tips should you give a new EMT about artificially ventilating a patient with the bag-valve mask?

A) "If the patient has dentures, they should be removed so a better mask-to-face seal can be achieved." B) "It is important to maintain the head-tilt, chin-lift or jaw-thrust maneuver while ventilating the patient." C) "To direct air into the lungs and away from the stomach, flex the patient's head forward when ventilating with the BVM." D) "Always remove the oropharyngeal airway. If it is in place when you are ventilating with a BVM, it may be pushed deep into the airway."

Health Professions