Which blood component is primarily responsible for oxygen transport?

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Multiple Choice

Which blood component is primarily responsible for oxygen transport?

Oxygen transport is carried out mainly by hemoglobin inside red blood cells. Hemoglobin is a protein with iron-containing heme groups that readily binds oxygen in the lungs and releases it in tissues that need it. The red blood cell’s biconcave shape also increases surface area for gas exchange, making the uptake and delivery of oxygen efficient. Plasma can carry a small amount of dissolved oxygen, but oxygen’s solubility in plasma is limited, so it cannot meet the whole body's needs. White blood cells and platelets serve other roles (immune response and clotting, respectively), while plasma is the liquid component that transports nutrients, hormones, and wastes. Therefore, red blood cells are the primary oxygen transporters.

Oxygen transport is carried out mainly by hemoglobin inside red blood cells. Hemoglobin is a protein with iron-containing heme groups that readily binds oxygen in the lungs and releases it in tissues that need it. The red blood cell’s biconcave shape also increases surface area for gas exchange, making the uptake and delivery of oxygen efficient.

Plasma can carry a small amount of dissolved oxygen, but oxygen’s solubility in plasma is limited, so it cannot meet the whole body's needs. White blood cells and platelets serve other roles (immune response and clotting, respectively), while plasma is the liquid component that transports nutrients, hormones, and wastes. Therefore, red blood cells are the primary oxygen transporters.

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