The Heart

https://www.youtube.com/watch?v=uR4t__B-Zwg

Heart Valve Replacement Surgery

Cardiovascular System Transportation of oxygen, nutrients, cell wastes, hormones = body homeostasis Made up of the Blood Heart Blood Vessels Heart provides the force to move blood

The Heart Approx. size of closed fist Flanked by the lungs Lies between the sternum and vertebral column (CPR) Rests of diaphragm Middle left of thoracic cavity Apex points downward left; base (broad part of heart) Inside pericardium

Heart Disease in the U.S.

Chamber of the Heart Atria = receiving chambers Ventricles = pumps out blood Blood flows from body  atria  ventricles  to body (2 circuits)

Chambers of the Heart 2 Atria 2 ventricles

Right Atrium Recieves blood from superior and inferior vena cava Blood passes through tricuspid valve to get to right ventricle https://www.youtube.com/watch ?v=ruM4Xxhx32U

Right Ventricle Tricuspid valve connected by chordae tendinae and then to papillary muscles Interventricular septum separates ventricles Blood goes through pulmonary valve into the pulmonary trunkwhich splits into right and left pulmonary arteries

Left Atrium Receives blood from lungs through 4 pulmonary veins Blood flows through bicuspid valve into left ventricle

Left Ventricle Chordae tendinae anchored by papillary muscles (of bicuspid valve) Blood passes through aortic valve into ascending aorta, then arch, and descending aorta Muscular wall MUCH thicker because it has to pump the same amount of blood FARTHER distance