Q1 of 95 Page 94

Explain the following terms:

Endothelium

Endothelium is the innermost layer of cells in the walls of arteries and veins made up of a single layer of squamous epithelium. The walls of the blood capillaries contain only Endothelium. It us a type of epithelium that lines the interior surface of blood vessels & lymphatic vessels forming an interface between circulating blood or lymph in the lumen & the rest of the vessel wall.


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5

Match the items in Column 'A' with those in Column 'B'. Rewrite the correct matching pairs.



































Column A



Column B



(a) S A Node



Plasma



(b) Defective haemoglobin in RBC



Serum



(c) Muscle fibres located in heart



Pacemaker



(d) The liquid squeezed Out of blood during clotting



Sickle cell anemia



(e) Never tires, keep on contracting and relaxing



Purkinje fibres



(f) Cardiac cycle



Cardiac muscle



(g) Liquid part of the blood Without corpuscles



0.85 sec


 6

The table below is designed to indicate the transport of certain substances in our body. Fill in the blanks with suitable answers:

































Substance



From



To



1. …………



Lungs



Whole body



2.Carbon dioxide



…………….



……………..



3. Urea



……………..



……………..



4. Digested carbohydrates



Intestine



…………………..



5. ……………..



……………..



Target organs


 1

Explain the following terms:

Lymph nodes

 1

Explain the following terms:

Venule