What substance is in the blood that the heart pumps throughout your body?

The substance in the blood that the heart pumps throughout the body is called plasma, which is a yellowish liquid that makes up about 55% of blood volume. Plasma contains water, electrolytes, nutrients, hormones, and waste products. Additionally, blood also contains red blood cells, white blood cells, and platelets, all of which are crucial for transporting oxygen, fighting infections, and aiding in clotting, respectively. Together, these components work to maintain overall bodily function and health.