1. Heart Atrium Pacemaker Ventricle Cardiovascular System
The body system that consists of the heart, blood vessels and blood
Heart
A hollow muscular organ that pumps blood throughout the body
Atrium
Each of the two uppers chambers of the heart that receives blood that comes into the heart
Pacemaker
A group of cells located in the right atrium that send out signals to make the heart muscle contract
Ventricle
A lower chamber of the heart that pumps blood out to the lungs and body

2. Valve Artery Capillary Vein Aorta
A flap of tissue in the heart or vein that prevents blood from flowing backward
Artery
A blood vessel that carries blood away from the heart
Capillary
A tiny blood vessel where substances are exchanged between the blood and the body cells
Vein
A blood vessel that carries blood back to the heart
Aorta
The largest artery in the body

3. Coronary Artery Pulse Diffusion Blood Pressure Plasma
An artery that supplies blood to the heart itself
Pulse
The alternating expansion and relaxation of an artery wall as blood travels through it
Diffusion
The process by which molecules move from an area of higher concentration to an area of lower concentration
Blood Pressure
The pressure that is exerted by the blood against the walls of the blood vessels
Plasma
The liquid part of the blood

4. Red Blood Cell Hemoglobin White Blood Cell Platelet Lymphatic System
A cell in the blood that takes up oxygen in the lungs and delivers it to the cells elsewhere in the body
Hemoglobin
An iron containing protein that binds chemically to oxygen molecules
White Blood Cell
A blood cell that fights disease
Platelet
A cell fragment that plays an important part in the forming of clots
Lymphatic System
A network of vein like vessels that return fluid that leaks out of blood vessels to the bloodstream

5. Lymph Lymph Node Heart Attack Hypertension Atherosclerosis
The fluid that the lymphatic system collects and returns to the bloodstream
Lymph Node
A small knob in the lymphatic system that filters lymph, trapping bacteria and other disease causing microorganisms
Atherosclerosis
A condition in which an artery wall thickens from a buildup of fatty material
Heart Attack
A condition in which blood flow to part of the heart muscle is blocked causing heart cells to die
Hypertension
A disorder in which a person’s blood pressure is consistently higher than normal