Ques. 1 What are is Leucocytes?
Ans. The Leucocyte or white blood corpuscles are one of the cellular elements of blood which are nucleated and serve mainly the defensive function of the body.
Ques. 2 What are the varieties of leucocytes?
Ans. Leucocytes are of two types broadly known as granulocytes and agranulocytes.
a) Agranulocytes, i.e. which not contain any granules in their cytoplasm, they are – (i) Lymphocyte, and (ii) Monocyte.
b) Granulocytes, i.e. the presence of granules in the cytoplasm, they are – (i) Neutrophil, (ii) Eosinophil, and (iii) Basophil.
Ques. 12 What are the variations of R.B.C. Count under physiological conditions?
Ans. Diurnal variation : maximum in the evening and lowest during sleep. (ii) Count rises: during the muscular exercise, at higher altitude, due to high external temperature, when O2 tension is low, when CO2 tension is high, when adrenal is ejected etc. (iii) Count falls : at lower altitude.
Ques. 13 What are the average ratio of total W.B.C. count with the total R.B.C. count?
Ans. It is about 1 : 700, i.e. for 1 WBC there are 700 RBC.
Ques. 14 What is Red Blood Corpuscle?
Ans. It is a red, non-nucleated and perfectly elastic, biconcave disc. It envelope consists of proteins & lipoids (cephalin, lecithin and cholesterol), and is responsible for its characteristic permeability. The envelope encloses a solution of haemoglobin and various electrolytes, e.g. K, Mg, Ca, and P.
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