What are the main components of blood?

The main components of blood consist of red blood cells, white blood cells, platelets, and plasma. Each of these components has a specific function critical to maintaining health and homeostasis.

Red blood cells (erythrocytes) are responsible for transporting oxygen from the lungs to the rest of the body and carrying carbon dioxide back to the lungs for exhalation.

White blood cells (leukocytes) are part of the immune system; they help the body fight infections and other diseases by identifying and destroying pathogens.

Platelets (thrombocytes) play a crucial role in blood clotting. They are essential for preventing excessive bleeding when injuries occur.

Plasma is the liquid component of blood, making up about 55% of its volume. It serves as a medium for transporting nutrients, hormones, proteins, and waste products throughout the body. Additionally, plasma contains various proteins that contribute to blood clotting and immune responses.

By listing these four components, the correct answer encompasses the complete and essential makeup of blood, revealing its complex role in various bodily functions.