Multiple choice

Blood capillaries are made of

  1. endothelium, connective tissue and muscle fibres

  2. endothelium and muscles fibres

  3. endothelium and connective tissue

  4. endothelium only
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood capillaries consist of a single layer of endothelial cells resting on a basement membrane, which allows for efficient exchange of gases, nutrients, and wastes between blood and surrounding tissues. They lack connective tissue and smooth muscle in their walls.

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