MP Board · Class 9 · Science · TissuesExplain why blood is classified as a connective tissue. Describe the major cellular components present in blood along with their main functions.

Blood is classified as a fluid connective tissue because it connects various body parts, systems, and organs by circulating through the cardiovascular network and transporting nutrients, gases, and metabolic waste products. Like all connective tissues, it consists of cells suspended in an extracellular matrix. \nThe fluid extracellular matrix is called plasma, which contains proteins, salts, and hormones. Suspended in plasma are three major cellular components:

1. Red Blood Corpuscles (RBCs / Erythrocytes): Contain the iron-rich protein hemoglobin, which binds to oxygen and transports it from the lungs to tissues across the body.
2. White Blood Corpuscles (WBCs / Leukocytes): Function as the defensive immune unit. They fight against foreign infections, neutralize pathogens, and produce antibodies.
3. Blood Platelets (Thrombocytes): Essential for blood clotting at injury sites to prevent excessive blood loss.