unit 4 - the circulatory system.ppt

文档介绍：Unit 4 The Circulatory System The circulatory system is responsible for delivering life sustaining oxygen and nutrients to the cells which are incapable of fending for themselves. The The Circulatory Circulatory System System The heart Blood Blood ponents Functions Transportation of the substances necessary to maintain cellular Protection The heart The heart the right atrium the right ventricle the left atrium the left ventricle the bicuspid valve the tricuspid valve blood blood cells plasma : oxygen-bearing red blood cells disease-fighting white blood cells blood-clotting platelets water, salts, proteins, vitamins, minerals, hormones, dissolved gases, and fats Blood vessels The heart arteries veins capillaries The arteries, veins and capillaries are divided into two systems of circulation: The systemic circulation c