Body fluids and circulation || NCERT line by line || पेपर यही से आऐगा😱😱😱 || part 3

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It is a fluid connective tissue composed of different cells (RBCs, WBCs and platelets). The pH of blood is ~7.4, i.e. slightly alkaline.

Plasma constitutes 55% of blood volume. It is a viscous fluid and contains 90-92% water. Other than water, plasma contains 6-8% proteins (fibrinogens, albumins and globulins), amino acids, glucose and small amounts of electrolytes (Na+, Ca++, Cl–, etc.).
Formed Elements include erythrocytes, leukocytes and blood platelets
Erythrocytes or RBCs are the most abundant cells present in the blood formed in the bone marrow

biconcave and without a nucleus

have a lifespan of 120 days and get destroyed in the spleen (RBCs’ graveyard)
have a life span of 3-4 days

granulocytes include neutrophils, eosinophils and basophils

agranulocytes include lymphocytes and monocytes

neutrophils have a polymorphic nucleus and have phagocytic ability

basophils are involved in inflammatory reactions as they secrete histamine, serotonin

eosinophils are involved in an allergic reaction

Blood platelets or thrombocytes are involved in the clotting of blood. They are formed from the megakaryocyte cells of bone marrow.
Leucocytes or WBCs are colourless due to the absence of haemoglobin. They are of two types granulocytes and agranulocytes.