What are the four main components of blood?

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The four main components of blood are plasma, red blood cells, white blood cells, and platelets. Plasma is the liquid portion of blood that carries cells, nutrients, hormones, and waste products throughout the body. Red blood cells are responsible for transporting oxygen from the lungs to the tissues and carbon dioxide back to the lungs for exhalation. White blood cells are crucial for the immune system as they help defend the body against infections and foreign invaders. Platelets play a vital role in blood clotting, which prevents excessive bleeding when injuries occur.

Understanding these components is fundamental to grasping how blood functions as a transport system in the body. The other options include components that are important to blood function or bodily systems, but they do not accurately represent the main components of blood itself. For instance, hemoglobin is found within red blood cells and is essential for oxygen transport but is not classified as one of the main blood components. Similarly, while antibodies are vital for immune response, they are a type of protein produced by white blood cells rather than a distinct component of blood.

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