Understanding Blood Composition: The 4 Key Components

The four main components of blood are:

Plasma: The liquid component of blood that makes up about 55% of its volume. It is composed of water, electrolytes, proteins, hormones, and waste products.

Red blood cells: Also known as erythrocytes, red blood cells make up about 45% of blood volume. They contain hemoglobin, a protein that carries oxygen from the lungs to the rest of the body.

White blood cells: Also known as leukocytes, white blood cells make up less than 1% of blood volume. They are part of the immune system and help protect the body from infection.

Platelets: Also known as thrombocytes, platelets make up less than 1% of blood volume. They play a role in blood clotting and help stop bleeding.