Patient Care Technician (PCT) AAH Practice Exam

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What is the primary function of venules?

Deliver oxygen to tissues
Gather blood from the capillaries into veins
Transport blood away from the heart
Regulate blood flow in the arteries

The correct answer is: Gather blood from the capillaries into veins

The primary function of venules is to gather blood from the capillaries and channel it into larger veins. After blood has circulated through the capillary beds, where nutrient and gas exchange occurs, it enters the venules. These small veins collect the deoxygenated blood and facilitate its return to the heart. Venules play a crucial role in the venous system by ensuring that the blood is efficiently collected and directed toward larger veins for the next phase of circulation. Other functions, such as delivering oxygen to tissues or transporting blood away from the heart, are primarily associated with arteries and arterioles instead. Additionally, while blood flow regulation is important, this function is more applicable to the arterial side of the circulation where smooth muscle in arteries helps to regulate diameter and blood flow.