Ontario Grade 9 Science Class Practice Exam 2025 - Free Grade 9 Science Practice Questions and Study Guide

Question: 1 / 400

Which component of blood is primarily responsible for oxygen transport?

White blood cells

Plasma

Platelets

Red blood cells

Red blood cells are primarily responsible for the transport of oxygen in the bloodstream. This is due to the presence of hemoglobin, a specialized protein found in red blood cells that binds oxygen molecules in the lungs and releases them to tissues throughout the body. The structure of red blood cells, which are biconcave in shape, provides a larger surface area for gas exchange, facilitating efficient oxygen uptake and delivery.

In contrast, white blood cells are mainly involved in the immune response, helping the body fight infections and diseases. Plasma serves as the liquid component of blood, carrying nutrients, hormones, and waste products, but it does not play a direct role in oxygen transport. Platelets are essential for blood clotting and do not contribute to the transport of gases. Thus, red blood cells are uniquely adapted and essential for the efficient transport of oxygen throughout the body.

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