What is the cardiac output at rest and during exercise, and the cardiac reserve if (a) the heart rate is 75 beats per minute and stroke volume is 70 mL at rest, and (b) if the heart rate is 150 beats per minute and stroke volume is 100 mL during exercise?
a.
To determine:
The cardiac output at rest and during exercise, and the cardiac reserve if (a) the heart rate is 75 beats per minute and stroke volume is
Concept introduction:
The amount of blood, which is pumped by either ventricle in one minute, is known as “cardiac output” (
To determine:
The cardiac output at rest and during exercise and the cardiac reserve if the heart rate is 75 beats per minute and stroke volume is
Explanation of Solution
The product of stroke volume and heart rate is called cardiac output. The heart rate (
The cardiac reserve cannot be determined because the body is at rest and has not performed exercise.
b.
To determine: The cardiac output at rest and during exercise and the cardiac reserve if the heart rate is 150 beats per minute and stroke volume is
Explanation of Solution
The product of stroke volume and heart rate is called cardiac output. The heart rate (
The heart rate is
The heart rate is
The “cardiac reserve” is equal to difference of “cardiac output during exercise” and “cardiac output at rest”. The cardiac reserve is calculated as follows:
The cardiac output at rest is
The cardiac output during exercises is
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Chapter 19 Solutions
Anatomy & Physiology
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- A person has an ejection fraction of 54% and an EDV of 130 mL. a) what is their stroke volume b) if they have a heart rate of 65 beats per minute, what is the cardiac output? c) If they increase their ED to 170 mL, what do you expect might happen to their ejection fraction (improve, stay the same or get worse)? Why- be complete in your answer. d) What law is this? e) How might the EDV be increased? Give at least one mechanism in detailarrow_forwardBlood Flow (BF)= (diff. in) Pressure (P) /Resistance (R) Assign these numbers to the equation above: If 6/3=2, when you increase 3, what happens to 6 in order to get 2 to stay the same?arrow_forwardDuring heavy exercise, how much cardiac output may increase?arrow_forward
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- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning