Emergency Medical Technician (EMT) Intermediate Practice Exam

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Prepare for the Emergency Medical Technician (EMT) Intermediate Test with focused study methods including flashcards and multiple-choice questions. Practice with hints and detailed explanations to boost your readiness for the exam.

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Which vessels are excluded when considering systemic vascular resistance?

Coronary vessels
Pulmonary vessels
Renal vessels
Mesenteric vessels

The correct answer is: Pulmonary vessels

When considering systemic vascular resistance, the primary focus is on the vessels that contribute to blood flow within the systemic circulation. Pulmonary vessels are excluded from this consideration because they are part of the pulmonary circulation, which is responsible for transporting blood between the heart and the lungs for oxygenation. Systemic vascular resistance specifically pertains to the opposition to blood flow in the systemic circulation, which includes arteries and arterioles that serve the body's tissues. This distinction is important in cardiovascular physiology because systemic and pulmonary circulations operate under different pressure dynamics and serve different purposes in the cardiovascular system. The coronary vessels, renal vessels, and mesenteric vessels all contribute to systemic vascular resistance since they are involved in supplying blood to different organs and systems throughout the body. Thus, pulmonary vessels are not included in systemic vascular resistance calculations, making them the correct answer in this context.