Question

Explain the following terms:
(a) Endothelium

(b) Lymph nodes

(c) Venule

(d) Diastole

Answer 1

(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 or they are small veins.
(d)Diastole– The relaxation of muscles of ventricles or atria.