How does the circulatory system transport oxygen, nutrients, waste products, and other substances throughout the body?

The circulatory system, also known as the cardiovascular system, is responsible for transporting oxygen, nutrients, waste products, and other substances throughout the body. It is composed of the heart, blood vessels, and blood.

The heart is the center of the circulatory system and is responsible for pumping blood throughout the body. The blood vessels, including arteries, veins, and capillaries, are responsible for carrying blood to and from the heart and the body's organs and tissues. The blood itself contains red blood cells, white blood cells, platelets, and plasma, which all play vital roles in transporting and protecting the body's cells.

When blood travels through the circulatory system, it picks up oxygen and nutrients from the lungs and digestive system, respectively. These substances are carried to the body's cells to provide them with energy and other necessary components. Waste products, such as carbon dioxide and urea, are also transported by the blood to the lungs and kidneys, respectively, for elimination from the body.

In addition to transporting oxygen, nutrients, and waste products, the circulatory system also plays a key role in regulating body temperature, maintaining fluid balance, and fighting infections.