Pregunta
If heart rate increases, initially, what must happen to keep the cardiac output the
same?
End systolic volume must decrease
Stroke volume must increase
Breathing rate must decrease
Stroke volume must decrease
End diastolic volume must be cut in half
Question 22 (1 point)
usten
The Frank-Starling Mechanism states that:
ventricular muscle walls) will result in increased contractility.
negative inotropic factors result in decreased contractility
positive chronotropic factors result in increased heart rate
a decreased preload will result in an increased contractility
same?
End systolic volume must decrease
Stroke volume must increase
Breathing rate must decrease
Stroke volume must decrease
End diastolic volume must be cut in half
Question 22 (1 point)
usten
The Frank-Starling Mechanism states that:
ventricular muscle walls) will result in increased contractility.
negative inotropic factors result in decreased contractility
positive chronotropic factors result in increased heart rate
a decreased preload will result in an increased contractility
Ask by Riley Gordon. in the United States
Mar 30,2025
Solución de inteligencia artificial de Upstudy
Respuesta verificada por el tutor
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Cardiac Output Question:
To keep cardiac output the same when heart rate increases, stroke volume must decrease.
To keep cardiac output the same when heart rate increases, stroke volume must decrease.
Frank-Starling Mechanism Question:
Ventricular muscle walls, when stretched, result in increased contractility.
Ventricular muscle walls, when stretched, result in increased contractility.
Solución
Step 1. Cardiac Output Question
The cardiac output (
where
If the heart rate increases and the cardiac output is to remain constant, then the stroke volume must decrease because
Among the given options, the correct answer is:
- Stroke volume must decrease
Step 2. Frank-Starling Mechanism Question
The Frank-Starling Mechanism states that an increase in the pre-load (which is reflected by the end-diastolic volume) increases the stretch of the ventricular muscle fibers. This increased stretch enhances the contractility of the heart muscle, allowing it to eject a larger volume of blood during systole.
This concept can be summarized as:
Thus, the appropriate statement is:
- Ventricular muscle walls (when stretched) will result in increased contractility.
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Simplifique esta solución Mind Expander
To keep cardiac output the same when heart rate increases, stroke volume must increase. This is because cardiac output is the product of heart rate and stroke volume. If heart rate goes up, the body compensates by boosting stroke volume to maintain the overall output, ensuring that blood circulation remains effective and efficient.
The Frank-Starling Mechanism is essentially a fascinating principle of heart function: the more the heart muscle is stretched (within limits), the stronger its contraction will be. This means that increased venous return (more blood filling the heart) leads to a greater end-diastolic volume, which results in enhanced stroke volume due to the elasticity of cardiac muscle fibers. It’s like a rubber band: the more you stretch it, the more it snaps back!
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