How does the human heart organ relate to an organ system

The human heart is an organ which make up the circulatory system.

Explanation:

An organ system is made when different organs of the body combine or work together to form a system.

For example, the heart, the lungs and the blood vessels (arteries, veins, capillaries) are a part of the circulatory system of the body. The heart is the organ that pumps blood to all parts of the body via the blood vessels. Hence, it an important organ and relates to organ systems.