An animal’s normal stroke volume is 9 mL/beat and its normal...

Name: Problem 5, Chapter 53: Biology
Uploaded: 2021-07-25T04:12:19-08:00
Duration: 41 s
Channel: Abigail Schammel
Description: An animal’s normal stroke volume is 9 mL/beat and its normal heart rate is 125 beats/min. Immediately after a hemorrhage, its heart rate increases to 161 beats/min and its stroke volume does not change. What is its new cardiac output? a. 1.45 L/min d. 17.9 L/min b. 0.145 L/min e. 0.055 L/min c. 17.9 mL/min d. 17.9 L/min e. 0.055 L/min

An animal’s normal stroke volume is 9 mL/beat and its normal heart rate is 125 beats/min. Immediately after a hemorrhage, its heart rate increases to 161 beats/min and its stroke volume does not change. What is its new cardiac output? a. 1.45 L/min d. 17.9 L/min b. 0.145 L/min e. 0.055 L/min c. 17.9 mL/min d. 17.9 L/min e. 0.055 L/min

An animal’s normal stroke volume is 9 mL/beat and its normal heart rate is 125 beats/min. Immediately after a hemorrhage, its heart rate increases to 161 beats/min and its stroke volume does not change. What is its new cardiac output?
a. 1.45 L/min d. 17.9 L/min
b. 0.145 L/min e. 0.055 L/min
c. 17.9 mL/min
d. 17.9 L/min
e. 0.055 L/min

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Key Concepts

Compensatory Mechanisms in Hemorrhage

In the context of hemorrhage, the body initiates compensatory mechanisms such as increasing heart rate to maintain adequate cardiac output despite reduced blood volume. This response helps to temporarily sustain blood pressure and tissue perfusion during blood loss.

Heart Rate

Heart rate is the number of heartbeats per minute. It directly affects cardiac output since an increase in heart rate, assuming constant stroke volume, results in a higher cardiac output, which is critical during physiological challenges or stress conditions.

Cardiac Output

Cardiac output is the volume of blood the heart pumps per minute and is calculated as the product of stroke volume and heart rate. It is a key parameter in understanding cardiovascular function and assessing how effectively the heart is meeting the body’s oxygen and nutrient demands.

Stroke Volume

Stroke volume is the amount of blood ejected by the heart in a single contraction. It is an important component in calculating cardiac output and provides insight into the heart's pumping efficiency and contractile strength.

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