   Chapter 11, Problem 8RQ

Chapter
Section
Textbook Problem

Between 30 and 80 years of age, the cardiac output decreases by aboutA. 10 percentB. 20 percentC. 30 percentD. 40 percent

Summary Introduction

Introduction:

Cardiac output can be defined as the amount of blood, which is pumped by the heart through the circulatory system in one minute. It can be deduced by taking the product of the heart rate and the stroke volume. A normal adult’s cardiac output is 4.7 liters of blood per minute.

Explanation

Justification for the correct answer:

Option (D) states that between 30 and 80 years of age, the cardiac output decreases by about 40 percent (%). This is a true statement, as after the age of 20, the cardiac output decreases linearly about 1 % per year. Between 30-80 years of age, it decreases about 40 %, irrespective of gender. Hence, option (D) is correct.

Justification for the incorrect answers:

Option (A) states that between 30 and 80 years of age, the cardiac output decreases by about 10%. This is incorrect as the cardiac output decreases about 40 %, after 30 years of age...

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