Asked by xochitl
What is systemic circulation?
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GPT-5 mini
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Systemic circulation is the part of the cardiovascular system that carries oxygenated blood from the left side of the heart to the body's tissues and returns deoxygenated blood back to the right side of the heart.
Key points
- Path: left ventricle → aorta → arteries → arterioles → capillaries (site of gas and nutrient exchange) → venules → veins → superior and inferior vena cavae → right atrium.
- Purpose: deliver oxygen and nutrients to cells and remove carbon dioxide and metabolic wastes.
- Blood characteristics: arterial blood in systemic arteries is oxygen-rich; blood in systemic veins is relatively oxygen-poor.
- Contrast: pulmonary circulation carries blood between the heart and lungs for oxygenation; systemic circulation distributes that oxygenated blood throughout the body.
- Clinical relevance: systemic vascular resistance and arterial pressure determine perfusion; disorders include hypertension, atherosclerosis, and shock.
Key points
- Path: left ventricle → aorta → arteries → arterioles → capillaries (site of gas and nutrient exchange) → venules → veins → superior and inferior vena cavae → right atrium.
- Purpose: deliver oxygen and nutrients to cells and remove carbon dioxide and metabolic wastes.
- Blood characteristics: arterial blood in systemic arteries is oxygen-rich; blood in systemic veins is relatively oxygen-poor.
- Contrast: pulmonary circulation carries blood between the heart and lungs for oxygenation; systemic circulation distributes that oxygenated blood throughout the body.
- Clinical relevance: systemic vascular resistance and arterial pressure determine perfusion; disorders include hypertension, atherosclerosis, and shock.
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