Answered: Activation of what receptor directly…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Related questions

Question

Activation of what receptor directly causes stimulation of the heart?

Alpha-1

alpha-2

beta-1

beta-2

Brta-3

Expert Solution

Step 1

Receptors are defined as the protein molecules present inside the target cell or found on its surface that will selectively receive and bind to a specific substance.

Step 2

The activation of the beta-1 receptor will increase the heart rate through the sino-atrial node, will increase the contractility due to the increase in the intracellular concentrations of calcium, and also due to an increased release of calcium by the sarcoplasmic reticulum, and will also increase the atrioventricular node's conduction velocity.

Therefore, the heart can be stimulated by the activation of the beta-1 receptor.