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Cardiac output must be responsive to changes in the metabolic demand. You know that cardiac output can be determined by:

Question

Cardiac output must be responsive to changes in the metabolic demand. You know that cardiac output can be determined by:

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Solution

Cardiac output is determined by two factors: heart rate and stroke volume.

  1. Heart Rate: This is the number of times the heart beats per minute. An increase in heart rate will increase cardiac output, assuming stroke volume remains constant.

  2. Stroke Volume: This is the amount of blood pumped out of the heart with each beat. An increase in stroke volume will increase cardiac output, assuming heart rate remains constant.

Therefore, if the body's metabolic demand increases, the heart can respond by increasing either the heart rate, stroke volume, or both to increase cardiac output and deliver more oxygen and nutrients to the tissues.

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Similar Questions

Cardiac output must be responsive to changes in the metabolic demand. You know that cardiac output can be determined by:*1 pointa. Measuring the amount of blood ejected per heartbeat and multiplying it to the client’s heart rate.b. Summing up the stroke volume with the client’s heart ratec. Getting the heart rate of the client and the client’s stroke volume and BPd. Getting the BP of the client multiply to the client’s heart rate

Define the term 'cardiac output' and describe the two components which comprise it.

The increase in cardiac output that occurs during exercise is due to_________

Exercise is associated with alterations to many basic physiological processes, including changes in metabolism and the cardiovascular system.  As the intensity of exercise rises, both the cardiac output and oxygen consumption increase, as shown in Figure 1.Figure 1  Changes in cardiac output and oxygen consumption in response to various levels of exerciseThe cardiac output CO represents the volume of blood pumped by the heart in 1 minute.  The CO is calculated from the heart rate HR and stroke volume SV using the equationCO = HR ∙ SVEquation 1Experimental data has shown that the HR increases linearly with the exercise output Eout, leading to the relationshipHR = 0.65 ∙ Eout + 75Equation 2The metabolism of nutrients consumes oxygen and generates carbon dioxide as a waste product.  The amount of carbon dioxide generated depends on the type of macronutrient that is consumed.  For example, when carbohydrates are metabolized, every liter of oxygen consumed causes the generation of 1.0 liter of carbon dioxide.  Alternatively, the metabolism of fats leads to 0.7 liters of carbon dioxide per liter of oxygen, and the metabolism of proteins generates 0.8 liters of carbon dioxide for each liter of oxygen. Question 56While exercising on a treadmill, a person has a cardiac output of 15 L/min and produces carbon dioxide at 0.091 mol/min.  What is their ratio of metabolizing carbohydrates to fats during the exercise?  (Assume all gasses are ideal and are at STP.)A.1:2B.1:1C.1:0D.2:1Submit

During heavy-intensity exercise, increases in cardiac output are associated with increases in_________a.the % of cardiac output increases, and the volume of blood increasesb.the % of cardiac output decreases, and the volume of blood increasesc.the % of cardiac output is unchanged, and the volume of blood is unchangedd.both systolic pressure generation and stroke volume.

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