The circulatory system is a system of organs that includes the heart, blood vessels, and blood, which is circulated throughout the entire body of a human or other vertebrate. It is also known as the cardiovascular system and is responsible for delivering oxygen, nutrients, and hormones to muscles, tissues, and organs throughout the body, as well as removing waste products like carbon dioxide. The circulatory system has two divisions: a systemic circulation or circuit, and a pulmonary circulation or circuit.

The systemic circulation carries oxygenated blood from the heart to the rest of the body through a network of arteries and veins, while the pulmonary circulation carries deoxygenated blood from the heart to the lungs where it is oxygenated and returned to the heart. The heart is the main organ of the circulatory system and is responsible for pumping blood throughout the body. Blood consists of plasma, red blood cells, white blood cells, and platelets.

The circulatory system is critical to healthy organs, muscles, and tissues, and it works with other systems in the body, such as the digestive system, to provide the nutrients the system needs to keep the heart pumping. The circulatory system also helps the body get rid of waste products. The types of blood vessels include arteries, capillaries, and veins, and they travel in one direction only to keep things going where they should.

In summary, the circulatory system is responsible for delivering oxygen, nutrients, and hormones to muscles, tissues, and organs throughout the body, as well as removing waste products like carbon dioxide. It includes the heart, blood vessels, and blood, and has two divisions: a systemic circulation or circuit, and a pulmonary circulation or circuit. The circulatory system is critical to healthy organs, muscles, and tissues, and it works with other systems in the body to provide the nutrients the system needs to keep the heart pumping.