Which vessels drain capillary beds?

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Question restatement: Which vessels drain capillary beds?

Option 1: Venules. These are the small vessels that collect blood from capillary beds and channel it into larger venous pathways. This is the correct mechanism in the microcirculation, where blood exits capillaries first through postcapillary venules and then continues into veins.

Option 2: Arterioles. Arterioles are the small branches of arteries that deliver blood to capillary beds. They do not drain capillaries; instead they supply them with blood before the capillary exchange occurs.

Option 3: Veins. While veins ultimately drain blood from capillary beds, the direct draining vessels from capillaries are the smaller venules that feed into veins. Saying veins drain capillary beds is less precise because veins receive blood after it has passed through the venules and capillaries, but the immediate drainage from the capillary network is via venules.

Option 4: Elastic arteries. These large arteries (like the aorta and major branches) conduct blood away from the heart and are not involved in draining capillary beds.

Option 5: Muscular arteries. Similar to elastic arteries, these arteries are part of the arterial system that distribute blood to tissues and do not drain capillaries.

In summary, the capillary network empties into the small venous vessels known as venules, whereas arterioles supply them and arteries form the upstream conduits. The other vessel types are structural components of the arterial side and are not responsible for draining capillaries.

ANATOMY 2300 AU2025 (34636) Unit 1: Introduction to the Cardiovascular System

Which vessels drain capillary beds?

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