Biology STAAR Practice Test 2025 - Free State of Texas Assessments of Academic Readiness Practice Questions and Study Guide

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What component of blood is responsible for transporting nutrients and gases?

Platelets

Red blood cells

Plasma

Plasma is the component of blood that is primarily responsible for transporting nutrients and gases. It makes up about 55% of total blood volume and is a yellowish liquid that consists mostly of water, but also contains proteins, electrolytes, hormones, and waste products. Plasma acts as a solvent, allowing nutrients such as glucose, amino acids, and vitamins to be dissolved and transported throughout the body. Additionally, it carries gases like oxygen and carbon dioxide, facilitating their exchange between tissues and the respiratory system.

Other components, such as red blood cells, are specifically designed for oxygen transport, while white blood cells are primarily involved in the immune response. Platelets play a crucial role in blood clotting rather than nutrient transportation. Therefore, the transport functions of plasma make it the correct answer in this context.

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White blood cells

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