cardiovascular system
the lungs
A human
The cardiovascular system.
circulatory system
human rights!
well their are valves in the human heart, and they control the amount of blood entering the heart, and the backflow of it aswell
A human circulatory system.
Systemic circulation is the part of the human transport system that delivers oxygen to the liver from the heart.
heart
circulatory system
Human rights and laws.
The main components of the transport system in human beings are the heart, blood, and blood vessels.