Consists of the heart, blood vessels, and blood
Cardiovascular System
A hollow, muscular organ that pumps blood
Heart
The upper chamber of the heart that receives blood that comes into the heart
Atrium
The lower chamber of the heart that pumps blood out of the heart
Ventricle
A flap of tissue that prevents blood from flowing backward
Valve
A group of heart cells that sends out signals that make he heart muscle contract.
Pacemaker
Blood Vessels that carry blood away from the heart.
Arteries
Tiny, narrow vessels.
Capillaries
Blood vessels that carry blood back to the heart.
Veins
The first branches of the aorta that carry blood to the heart itself.
Coronary Arteries
________ is caused by the alternating expansion and relaxation of the artery wall.
Pulse
Process by which molecules move from an area of higher concentration to an area of lower concentration.
Diffusion
The force blood exerts against the walls of blood vessels.
Blood Pressure
The liquid part of blood
Plasma
Deliver oxygen from the lungs to cells elsewhere in the body.
Red Blood Cells
________ is an iron-containing protein that binds chemically to oxygen molecules.
Hemoglobin
The body's disease fighters.
White Blood Cells
_______ are cell fragments that play an important part in forming blood clots.
Platelets
The body's drainage system.
Lymphatic System
The fluid inside the lymphatic system is called ________.
Lymph
Small knobs of tissue.
Lymph Nodes
A condition in which an artery wall thickens as a result of the buildup of fatty materials.
Atherosclerosis
A _____________ occurs when blood flow to part of the heart is blocked.
Heart Attack
____________ is a disorder in which a person's blood pressure is consistently higher than normal.
Hypertension

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