Cardiorespiratory System Health Mrs. Jones

 The heart has the following characteristics:  4 chambers  Size of a fist  Located just beneath the sternum  It’s function is to pump blood through 2 separate circulatory systems  Pulmonary circulation  Systemic circulation

The Cardiovascular System  Circulation – pumping of blood through the entire body by the heart.

 Blood pressure is the force exerted by blood on the walls of the blood vessels, created by the heart  There are two specific pressures measured:  Systolic (systole)  Diastolic (diastole)  Arteries carry blood away from the heart while Veins carry blood back to the heart

 Transport oxygen from the lungs to the tissues for use in cellular metabolism  Removal of carbon dioxide  Hemoglobin iron-protein molecule which carries oxygen  Average volume: 5-6 quarts men  4-5 quarts women

 This system supplies oxygen to the body, carries carbon dioxide away  Pressure from the diaphragm and ribs allow air to flow from lung tubes to air sacs called alveoli  Gas exchange occur at the alveoli and allow oxygen to return to the heart and systemic system  The ability to pick up and deliver oxygen is critical for the functioning of the body

 Lungs expand and recoil to move air by :  Downward and upward movement of the diaphragm  Elevation and depression of the ribs  Normal breathing is accomplished mostly by the diaphragm  During exercise: abs help

 knowitall.scetv.org/.../vsi/The%20Ca rdiovascular%20System.ppt