A vessel carries blood away from the heart under high pressure and needs thick walls to handle it[[cite:1]][[cite:2]]. Which vessel is this?
Difficulty: Easy
A tiny vessel is the main resistance point before capillary beds, and tightening or relaxing it changes blood pressure and where blood flows[[cite:5]][[cite:6]]. Which vessel is this?
Difficulty: Medium
A microscopic vessel slows flow enough for oxygen, nutrients, and wastes to move between blood and surrounding tissues[[cite:9]][[cite:10]]. Which vessel is this?
Difficulty: Easy
A small vessel gathers blood from capillary beds and passes it toward larger veins; its walls are thin and pressure is low[[cite:13]][[cite:14]]. Which vessel is this?
Difficulty: Medium
A vessel returns blood to the heart at lower pressure and often uses valves to help prevent backflow[[cite:17]][[cite:18]]. Which vessel is this?
Difficulty: Easy
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