Question

describe the components of whole blood and explain why it is classified as a connective tissue.

Answer 1

Blood is a fluid connective tissue :

It is a tissue which consists of fibre free matrix called plasma and living cells that do not produce matrix. It includes blood and lymph.

Blood composed of blood plasma and formed elements or blood cells, the Red blood cells, White blood cells and platelets.

Plasma :

It is a fluid matrix of blood it consists of 92℅ of water and 8℅ of solutes. Solutes include plasma proteins, minaral salts, nutrients, gases, excretary wastes, enzymes, hormones, etc. Plasma proteins include albumins, globulins and blood clotting proteins such as fibrinogens and prothrombin.

Formed elements :

Erythrocytes (RBC) , Leucocytes (WBC) and platelets.

1) Red blood corpucles ( erythrocytes)

Erythrocytes are circular or biconcave and enucleate. The number of RBC per cubic millimeter of blood is 5 millions in men and 4.5 millions in women. Life span of RBC in human is about 120 days.

2) White blood cells ( leucocytes)

These are nucleate, colourless, complete cell. They are spherical or irregular in shape. They are larger than in RBC in size and less than RBC in number. The total leucocytes count is 6,000 - 10,000 per cubic millimeter of blood under normal conditions

WBC are of two types :

Granulocytes and Agranulocytes

Granulocytes : These are three types 1) Basophils 2) Eosinophils 3) Neutrophils.

Basophils :

They constitute about 0.4℅ of total leucocytes. Nucleus is divided into irregular lobes. They take basic stains. They produce heparin, histamine.

Eosinophils :

They constitute about 2.3℅ of total leucocytes. Nucleus is distinctly bilobed. They play a role in allergic reactions.

Neutrophils :

They constitute about 62℅ of total leucocyte. Nucleus may be many lobed. These are active phagocytic cells..

Agranulocytes :

Cytoplasmic granules are absent in agranulocytes. These are two types lymphocytes and monocytes

Lymphocytes: They are constitute about 30℅ of total leucocytes. Nucleus of these cells is not divided into lobes.

Monocytes They constitute about 5.3℅ of the leucocytes. The nucleus is kidey shape.

3) Platelets :

These are colourless non - nucleate, round or oval biconvex discs. Number of platelets per cubic mm of blood is about 2,50,000 - 4,50,000. The average life span of platelets is about 5 to 9 days.

Lymph :

Lymph is a colorless fluid. It lacks of RBC, platelets and large plasma protins, but has more number of leucocytes. It contains vary small amount of nutrients and oxygen, but abondent CO2 and other metabolites.

Blood is classified as a connective tissue because orgin in Mesoderm as like other conective tissues. It connect all the bodyparts supply the nutrients minarals gases, hormones,weaste Metreials, and contains fibers, cells, matrix.