Circulatory System of Man — Flashcards

Answer

A multicellular body needs a transport system because every cell is not in direct contact with the external environment. The system supplies oxygen, nutrients, and other vital materials to cells, remo…

Answer

Blood is a fluid connective tissue. It is made of a liquid part called plasma and formed elements such as red blood cells, white blood cells, and platelets.

Answer

Normal blood volume is about 4.5 to 5.5 litres in a woman and 5 to 6 litres in a man. Blood is slightly alkaline with pH 7.4, and its specific gravity is 1.05 to 1.06.

Answer

Plasma is the whole blood minus the formed elements floating in it. It is about 55% of total blood volume, transparent, alkaline, straw-coloured fluid with about 92% water and 8% solids. Serum is plas…

Answer

Albumin maintains osmotic pressure of blood. Globulin helps in transport of substances and antibody formation. Fibrinogen and prothrombin help in blood clotting.

Answer

Red blood cells, also called erythrocytes, are biconcave blood cells containing haemoglobin. Mature RBCs in mammals including man are enucleated, which helps them remain biconcave. They transport oxyg…

Answer

The biconcave shape provides a larger surface area for diffusion of oxygen and carbon dioxide. It also helps RBCs pass easily through tiny capillaries.

Answer

Normal adult RBC count is about 5 million per cubic mm in males and about 4.5 million per cubic mm in females. Normal adult blood contains approximately 15 gm of haemoglobin per 100 ml of blood.