Atrium (pl. atria)
Upper chamber of the heart that recieves the blood.
Lower chamber of the heart that pumps blood out of the heart.
Dividing wall membrane.
Pathway of blood vessels on the right blood vessels on the right sideof the heart that carries blood.
Pathway of blood vessels on the left side of the heart that supplies the body with oxygen-rich blood and returns oxygen-poor blood to the heart.
Also known as the pacemaker; area of the heart that regulates the heartbeat.
part of the brainstem that regulates the flow of information between the brain and the rest of the body; controls involuntary functions.