Which of the following will have a positive influence on stroke volume? decreasing afterload decreasing preload decreasing norepinephrine decreasing contractility

Answered: Which of the following will have a…

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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Question

Which of the following will have a positive influence on stroke volume?

		decreasing afterload
		decreasing preload
		decreasing norepinephrine
		decreasing contractility

Expert Solution

Introduction

The blood volume pumped by the left ventricle in one heartbeat is called the stroke volume. It is calculated by computing the difference between the volume of the blood present in the ventricles during the start and end of a heartbeat.

The volume of the blood present in the ventricles is found from the volume of the ventricles in an echocardiogram. In a healthy man, the stroke volume ranges between 50 to 100 ml. The cardiac output of the heart is strongly influenced by the stroke volume. Various disease conditions correspond to a decrease in stroke volume.