Body Fluids and Circulation – Notes

Body Fluids
Blood liquid connective tissue that consists of 55% liquid plasma and 45% formed elements called blood cells.
Major proteins in plasma include albumins, globulins and fibrinogens.
Formed elements include erythrocytes, leucocytes and platelets.
Erythrocytes of Red Blood Cells (RBCs) are involved in the transport of respiratory gases.
Leucocytes or White Blood Cells (WBCs) include neutrophils, eosinophils, basophils, lymphocytes and monocytes.
Clotting or coagulation is a protective mechanism that takes place at an injured site to prevent loss of blood.
Interstitial fluid or tissue fluid is formed when some quantity of water and water-soluble substances squeeze out from the blood capillaries into the inter-cellular spaces.
Lymph is a colourless fluid that contains lymphocytes, nutrients, hormones and proteins.

Blood Groups
The presence or absence of ‘A’ and ‘B’ antigens on the surface of RBCs determines ABO blood groups.