| Composition of various parts of the circulatory system in humans (Artery, vein, arteriole, venule and capillary) is depicted in the form of bar graphs. Select the correct option with appropriate part/structure and composition. |
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A) A-Venule; B-Capillary; C- Vein; D-Arteriole; E-Artery
B) A-Capillary; B-Artery; C-Vein; D-Arteriole; E-Venule
C) A - Venule; B-Arteriole; C-Artery; D-Capillary, E-Vein
D) A-Arteriole; B-Capillary, C-Artery; D-Venule; E-Vein
Correct Answer: A
Solution :
| Venule [A] walls have three layers: an inner endothelium a middle layer of muscle and elastic tissue and an outer layer of fibrous connective tissue. The middle layer is poorly developed so that venules have thinner walls than arterioles. Capillaries consist of a single layer of endothelium [B]. The walls of veins [C] have the same three layers as the arteries [E]. Although all the layers are present there is less smooth muscle and connective tissue. |
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