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Circulatory System Also referred to as cardiovascular or vascular system; controls the steady circulation of blood Blood-vascular System • Consists of heart and blood vessels (arteries, capillaries and veins) for circulation of blood Lymph-vascular (Lymphatic) System • Consists of lymph glands and vessels through which lymph circulates • Lymph is derived from blood and gradually shifted back into bloodstream Heart Heart is muscular Conical-shaped Organ about size of a closed fist Weighs approximately 9 ounces Located in the chest cavity Heart • Pericardium – Membrane which encloses the heart • Resting heart rate – Normally about 72-80- times a minute • Vagus – Tenth cranial nerve • Helps regulate heartbeat • Autonomic Nervous system – Also helps regulate the heartbeat with the vagus Chambers and valves of heart interior • Right and left atrium – Also called auricle – Upper, thin-walled chambers • Right and left ventricle – Lower thick-walled chambers Chambers and valves of heart interior • Valves – Allow blood to flow in only one direction • Atria – When heart contracts and relaxes,the blood flows in, traveling from the atria to the ventricles; it’s then driven out to be distributed throughout the body Blood circulation • The blood is in constant and continuous circulation from leaving the heart upon returning to the heart Blood circulation • Pulmonary circulation – Brings blood from heart to lungs to be purified • System or general circulation – Carries blood from heart throughout body and back to heart as follows: • Blood flows atrium, flows through the tricuspid valve into right ventricle Blood circulation con’t – Right ventricle pumps blood to lungs where it releases waste gases and receives oxygen; blood is then oxygen rich – Oxygen-rich blood returns to heart, entering the left atrium – From left atrium, blood flows through the mitral valve into left ventricle – Blood then leaves left ventricle and travels to all body parts