List three parts of the human body and what their used for.

Skeletal system. The skeletal system is composed of bones and cartilages. The skeletal system’s main function is to provide support for the body. For example, the spinal column provides support for the head and torso.  

Muscular system. The muscular system consists of all the body muscles. Its used to keep the blood flowing and tracked.

Cardiovascular system. The cardiovascular system is comprised of the heart and the circulator.

Answer

Brain. The brain is the body's control center.

Heart. The heart is the most important organ of the circulatory system, which helps deliver blood to the body.

Lungs. The lungs work with the heart to oxygenate blood.

Explanation:

answer; all of the above;