The two primary cardiac responses to sympathetic discharge are which pair?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the RCES Exam with flashcards and multiple choice questions, each offering hints and detailed explanations. Ensure your success with a comprehensive study plan!

Multiple Choice

The two primary cardiac responses to sympathetic discharge are which pair?

Explanation:
Sympathetic activation makes the heart beat faster and pass impulse more quickly from atria to ventricles. Norepinephrine acting on beta-1 receptors in the SA node speeds the rate of spontaneous depolarization, increasing heart rate (positive chronotropy). It also acts on the AV node to enhance calcium-mediated conduction, shortening the AV nodal delay and increasing conduction velocity (positive dromotropy). Together, these changes raise cardiac output during demands like exercise or stress. The other patterns would either slow the heart or slow AV conduction, which is not how sympathetic discharge affects the heart.

Sympathetic activation makes the heart beat faster and pass impulse more quickly from atria to ventricles. Norepinephrine acting on beta-1 receptors in the SA node speeds the rate of spontaneous depolarization, increasing heart rate (positive chronotropy). It also acts on the AV node to enhance calcium-mediated conduction, shortening the AV nodal delay and increasing conduction velocity (positive dromotropy). Together, these changes raise cardiac output during demands like exercise or stress. The other patterns would either slow the heart or slow AV conduction, which is not how sympathetic discharge affects the heart.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy