A vessel carries blood away from the heart under high pressure and needs thick walls to handle it[1][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[5][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[9][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[13][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[17][18]. Which vessel is this?
Difficulty: Easy
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