Human Body Systems

The human heart has 4 chambers: two atria and two ventricles.

The primary function of the heart is to pump blood throughout the body.

Muscle tissues in the heart contract to pump blood to the rest of the body.

When you exhale, your body releases carbon dioxide.

The nervous system is known as the 'control center' and uses a network of nerves to connect the body to the brain.

The two main types of circulation are systemic circulation and pulmonary circulation.

The systemic circulation carries oxygenated blood from the heart to the rest of the body and returns deoxygenated blood back to the heart.

The pulmonary circulation carries deoxygenated blood from the heart to the lungs for oxygenation and returns oxygenated blood back to the heart.

Red blood cells transport oxygen from the lungs to the body's tissues and carry carbon dioxide back to the lungs.

The respiratory system is responsible for the exchange of gases (oxygen and carbon dioxide) between the body and the environment.