Circulatory System Crossword Puzzle

QUESTIONS LIST:

• arteries : blood vessels that carry blood away from the heart
• cardiovascular : _ system consists of the heart, blood vessels, and blood
• veins : blood vessels that carry blood back to the heart
• pacemaker : a group of heart cells that sends out signals that make the heart muscle contract
• capillaries : place where substances are exchanged between the blood and body cells
• heart : hollow, muscular organ that pumps blood throughout the body
• aorta : largest artery in the body
• pulse : the alternating expansion and relaxation of the artery walls
• blood pressure : a force exerted by blood against the walls of blood vessels
• white : _ blood cells - the body's disease fighters
• valve : a flap of tissue that prevents blood from flowing backward
• ventricle : lower chambers of the heart
• red : _ blood cells - take up oxygen in the blood and deliver it to cells elsewhere in the body
• plasma : the liquid part of blood
• atrium : upper chambers of the heart
• hemoglobin : iron-containing protein that binds chemically to oxygen molecules
• diffusion : the process by which molecules move from an area of higher concentration to an area of lower concentration