Question

Human blood maintains homeostasis in the internal environment of the body by

• A. Replenishment of oxygen and elimination of $C{O}_2$.
• B. Replenishment of nutrients and oxygen and elimination of metabolic wastes from the extra cellular fluid.
• C. Maintenance of ion concentration in the blood and body fluids by eliminating nitrogenous wastes.
• D. Maintenance of blood sugar level and conversion of amino acids into urea and destruction of worn out RBCs.

Answer 1

The correct option is B Replenishment of nutrients and oxygen and elimination of metabolic wastes from the extra cellular fluid.

Maintaining a steady internal environment by maintaining equilibrium within the body, for its proper functioning is called homeostasis. Human blood plays multiple functions in maintaining homeostasis. Blood acts as the vehicle that carries messengers, nutrients and essential elements like glucose, potassium, sodium, proteins, hormones, and enzymes for organs to function at a normal level. It helps in transport and exchange of respiratory gases. It carries cellular wastes, in particular, carbon dioxide and lactic acid away from the cells. It regulates body temperature through vasodilation and vasoconstriction. It plays a major role in maintaining acid-base balance (pH) in the body through red blood cells, and bicarbonate ions, by regulating the amount of $C{O}_2$.