Question

Explain the following terms:

(a) Endothelium

(b) Lymph nodes

(c) Venule

(d) Diastole​

Answer 1

$\huge\fbox\red{Hi\:mate}$

Question

Explain the following terms:

(a) Endothelium

(b) Lymph nodes

(c) Venule

(d) Diastole

Answer

$\Large\fbox\orange{Endothelium}$

◇Endothelial cells form a single cell layer that lines all blood vessels and regulates exchanges between the bloodstream and the surrounding tissues.

◇Signals from endothelial cells organize the growth and development of connective tissue cells that form the surrounding layers of the blood-vessel wall.

$\Large\fbox\orange{Lymph\:Nodes}$

◇Lymph nodes are small structures that work as filters for harmful substances.

◇They contain immune cells that can help fight infection by attacking and destroying germs that are carried in through the lymph fluid.

◇There are hundreds of lymph nodes throughout the body.

$\Large\fbox\orange{Venule}$

◇A venule is a very small blood vessel in the microcirculation that allows blood to return from the capillary beds to drain into the larger blood vessels, the veins.

◇Venules range from 7μm to 1mm in diameter. Veins contain approximately 70% of total blood volume, 25% of which is contained in the venules.

$\Large\fbox\orange{Diastole}$

◇Diastole, in the cardiac cycle, period of relaxation of the heart muscle, accompanied by the filling of the chambers with blood.

◇Diastole is followed in the cardiac cycle by a period of contraction, or systole (q.v.), of the heart muscle.

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