The fact that an increase in end-diastolic ventricular volume increases the stroke volume of the heart is an illustration of the…- influence of the parasympathetic nervous system on cardiac output.- influence of atrioventricular node on cardiac output.- Frank-Starling law of the heart. – influence of blood pressure on cardiac output.
Frank-Starling law of the heart.
The fact that an increase in end-diastolic ventricular volume increases the stroke volume of the heart is an illustration of the Frank-Starling law of the heart. This law states that the greater the volume of blood in the ventricles during diastole (the phase of the heartbeat where the heart relaxes and fills with blood), the greater the force with which the heart contracts during systole (the phase where the heart contracts and pumps blood out of the heart). This increased force of contraction results in a larger volume of blood being pumped out of the heart with each beat, leading to an increase in stroke volume. This mechanism helps to maintain cardiac output in response to changes in venous return, which can occur with changes in posture, exercise, or other physiological changes. The parasympathetic nervous system and atrioventricular node may also influence cardiac output, but they are not directly related to the Frank-Starling law. Blood pressure may affect end-diastolic volume indirectly, but it does not directly affect the Frank-Starling mechanism.
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