Anatomy And Physiology II (APII) Milestone 1 Practice Test

Which vessels primarily adjust resistance to regulate regional blood flow?

Venules Capillaries Large arteries Arterioles

Correct Answer:

Arterioles

Explanation:

Arterioles regulate regional blood flow by adjusting vascular resistance through their smooth muscle in the vessel walls. Their muscular layer allows them to constrict or dilate in response to neural signals, hormones, and local metabolic needs. Because resistance to flow depends very strongly on radius (even small changes in diameter dramatically change resistance), arterioles act as the main control points for distributing blood to specific tissues. Venules and capillaries have little smooth muscle and are more about drainage and exchange, while large arteries are thick-walled conduits that stay wide most of the time and don’t regulate flow to individual regions.

Access more questions from this quiz

Continue to Anatomy and Physiology II (APII) Milestone 1 Practice Test for more practice questions and the full quiz experience.

Access More Questions