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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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Chapter
Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

The force the ventricles must work against to pump blood is called

A. Myocardial contractility

B. Ventricular afterload

C. Negative inotropism

D. Ventricular preload

Summary Introduction

Introduction:

The two lower heart chambers are called ventricles. They receive blood from the atria and the blood is expelled through pulmonary vessels and aorta. During diastole, blood is filled in the ventricles and creates a blood pressure. Against this pressure, work is done to pump the blood out of the ventricles.

Explanation

Justification for the correct answer:

Option (b) is ventricular afterload. Diastole and systole help in filling and pumping the blood. During a diastole, blood is filled in the ventricles and causes an increase in the blood pressure in the ventricles. Work must be done by the ventricles against this pressure, during systole. This is called ventricular afterload. Hence, option (b) is correct.

Justification for the incorrect answers:

Option (a) is myocardial contractility. It is incorrect because myocardial contractility is defined as the contraction of the cardiac muscle or myocardium, irrespective of any load applied...

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