The circulatory system consists of three independent systems ... to the body's cells and then returns deoxygenated blood back to the heart. The system of blood vessels in the human body measure ...

The five vital organs in the human body are the brain, heart, lungs, kidneys, and liver. Other organs include the gallbladder, pancreas, and stomach. Organ systems, such as the nervous system ...

This allows the messages to be exchanged between your brain and body. Your peripheral nervous system is further divided into two main parts: the autonomic and somatic nervous systems. This is the ...