1.

What are the following?(a) Endothelium (b) Lymph nodes(c) Venule (d) diastole

Answer» (a) Endothelium- It is the innermost layer of the muscular wall of an artery or a vein which faces the lumen.

(b) Lymph nodes- The structures from which fresh lymph channels arise which pour the lymph into major anterior veins.

(c) Venule- The smallest common blood vessel formed by the union of capillaries.

(d) Diastole- The relaxation of muscles of ventricles or atria.


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