Question

Oxygen is transported through blood mainly by:

• A. Leucocytes
• B. Erythrocytes
• C. Thromobocytes
• D. Blood plasma

Answer 1

Answer: (B)

• Erythrocytes, also known as red blood cells (RBCs), function to transport Oxygen in the blood.
• They do so with the help of Haemoglobin, a respiratory pigment.
• The shape and structure of Erythrocytes are ideal for this function.
• They lack a nucleus and few other organelles so that maximum space in the cell can be used to accommodate Haemoglobin molecules.
• Leucocytes are involved in immune response while Thrombocytes are involved in blood clotting.
• Blood plasma does not contribute to O${}_2$ transport.
• Thus, option B is correct.