Right atrium and left atrium –upper chambers of the heart Right ventricle and left ventricle –Lower chambers of the heart The heart is near the center of the chest, slightly to the left
Pathway of blood through the heart A large vein called the superior vena cava brings the blood from the upper part of the body to the heart, where it enters the right atrium. The blood is pumped out of the right atrium into the right ventricle and travels through the pulmonary artery to the lungs where it picks up oxygen.
Pathway of blood through the heart From the lungs, blood travels through the pulmonary veins and returns to the heart, where it enters the left atrium. Finally, the blood is forced from the left ventricle into the aorta which carries it to the tissues of the body.
What are the major components of blood? Red blood cells –Transport oxygen to the body via hemoglobin White blood cells –Part of immune system, fight infection Platelets –Involved in blood clotting Plasma –Fluid portion of blood (90% water, 10% dissolved substances)
What are the three types of VESSELS and their functions? Veins –blood vessels that return blood to the heart Arteries –blood vessels that carry blood away from the heart to the body tissues Capillaries –smallest blood vessels –bring nutrients and oxygen to tissues and absorb carbon dioxide and waste products
What might happen if a blood clot forms inside the circulatory system and lodges in a major blood vessel? Heart attack –lack of oxygen to the heart Stroke –lack of oxygen to the brain Tissue damage –due to lack of oxygen