JBL EMT Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the JBL EMT Exam and improve your chances of success. Study with our flashcards, multiple-choice questions, hints, and explanations. Get exam-ready!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Stimulation of alpha-adrenergic receptors results in:

constriction of the blood vessels
dilation of the blood vessels
increased cardiac contractility
increased heart rate

The correct answer is: constriction of the blood vessels

Stimulation of alpha-adrenergic receptors results in the constriction of blood vessels. Alpha-adrenergic receptors are predominantly located in the walls of blood vessels. When these receptors are stimulated, it causes smooth muscle contraction in the blood vessel walls, leading to vasoconstriction. This constriction of blood vessels helps in increasing blood pressure by reducing the diameter of the vessels, consequently increasing systemic vascular resistance. While choices C and D may also be effects of adrenergic stimulation, they are primarily mediated by beta-adrenergic receptors rather than alpha-adrenergic receptors. Choice B is incorrect as stimulation of alpha-adrenergic receptors does not result in the dilation of blood vessels, but rather their constriction.