BOOKS4BIO

Study of blood – Hematology Process of blood formation – Hemopoesis pH of blood – 7.4 Blood is a pseudo connective tissue because – 1.Blood cells doesn’t divide 2.Blood’s matrix is fiber less 3.Matrix of blood is synthesized in liver and lymph organs. Composition of Blood – Liquid part (55%) – Plasma Solid part (45%) – RBC, WBC, Platelets. Whole volume of blood cells in whole blood is called PCV (Packed Cell Volume). RBC’s total volume in blood is called HV (Hematocrit Volume). PCV is almost same to HV, because RBC is 99% of all blood cells. Plasma – Plasma is a straw colored, viscous fluid constituting nearly 55 percent of the blood. 90-92 percent of plasma is water and proteins contribute 6-8 percent of it. Fibrinogen, globulins and albumins are the major proteins. Fibrinogens are needed for clotting or coagulation of blood. Globulins primarly are involved in defense mechanisms of the body and the albumins help in osmotic balance. Plasma also contai...

Osmotic Pressure – Osmotic pressure is a solution’s pressure which stops solvent’s movement through semipermeable membrane when it is applied against the direction of solvent’s movement. OP of the pure solvent is also 0. OP is a character of solute. Atriplex contertifolia has maximum OP. (It’s OP is about 202.5 atm.) Significance of Osmotic pressure – I. Water absorption by roots in soil. II. Important role in opening and closing of stomata. III. Movement in Mimosa pudica. IV. Important for Turgor pressure. Turgor Pressure (TP) & Wall Pressure (WP) – When a plant cell is drowned in water, molecules of water is started to enter into the cell because of the high OP of vacuole sap. In this process the protoplasm started to push cell wall from inside to outside, this pressure is called Turgor Pressure (TP). We know that the cell wall is also rigid, so it pushes back against Turgor Pressure, it is called Wall Pressure (WP). So we can say that the opposit...