Systemic vascular resistance describes which concept?

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Prepare for the NREMT AEMT Test. Study with flashcards and multiple-choice questions. Each question includes hints and explanations. Get ready for your exam now!

Multiple Choice

Systemic vascular resistance describes which concept?

Explanation:
Systemic vascular resistance is the resistance the systemic vasculature offers to blood flow, i.e., the afterload the left ventricle must overcome to eject blood into the aorta. It depends on arteriolar radius, blood viscosity, and vessel length; small changes in diameter have a big impact on resistance. Clinically, increasing vasoconstriction raises SVR and makes the heart work harder, while vasodilation lowers SVR. In contrast, the other descriptions refer to pressures in specific chambers or pressures of the heart during systole, or to pressures in the pulmonary circulation, not to the resistance posed by the systemic vessels.

Systemic vascular resistance is the resistance the systemic vasculature offers to blood flow, i.e., the afterload the left ventricle must overcome to eject blood into the aorta. It depends on arteriolar radius, blood viscosity, and vessel length; small changes in diameter have a big impact on resistance. Clinically, increasing vasoconstriction raises SVR and makes the heart work harder, while vasodilation lowers SVR. In contrast, the other descriptions refer to pressures in specific chambers or pressures of the heart during systole, or to pressures in the pulmonary circulation, not to the resistance posed by the systemic vessels.

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