The Circulatory System. Video Introduction (22min). The Body’s Transport System. Made up of the heart , blood and a series of blood vessels . Jobs : Delivers nutrients and oxygen to the body cells. Carries carbon dioxide and other wastes away from the body cells.
The Circulatory System Video Introduction (22min)
The Body’s Transport System • Made up of the heart, blood and a series of blood vessels. • Jobs: • Delivers nutrients and oxygen to the body cells. • Carries carbon dioxide and other wastes away from the body cells. • Protects the body from disease and infection.
The Heart • Cardiac muscle • Involuntary like smooth muscle • Reacts quickly & Striated like skeletal muscle • Doesn’t tire • Only rests between beats • Approximately the size of your fist. • Located slightly to the left of your sternum. • Pumps approximately 5 L of blood per minute. • Heartbeat is controlled by a special tissue – pacemaker. • Sends out signals to the heart muscle that controls contractions.
The Heart Aorta Superior Vena Cava Pulmonary Artery Pacemaker Pulmonary Artery Pulmonary Vein Pulmonary Vein Left Atrium Right Atrium Valves Valves Right Ventricle Left Ventricle Inferior Vena Cava Septum
The Heart • Your heart is made up of four chambers: • Two upper chambers – Atrium (Atria = singular) • Two lower chambers - Ventricles • The heart is also split into left and right sides • separated by a thick wall of tissue – Septum • Blood will never cross between the two sides. • As we discuss the heart from now on, YOU will become the doctor and THE HEART will be the patient laying on the operating table. • Left becomes Right and Right becomes Left!!!!!!!
Divisions & Chambers Right Side Left Side Upper Chambers – Atrium Lower Chambers – Ventricles
Blood leaving the heart -to the head. Flow of Blood Blood returning to the heart from the head. Blood going to the lungs Blood going to the lungs Blood going back to the heart from the lungs Blood going back to the heart from the lungs Blood leaving the heart -to the body. Blood returning to the heart from the body.
Myths about the Color of Blood • Is blood really blue? • NO – blood is NOT blue!!!!!! BLOOD IS RED!!!!! • Blood can either be: • high in oxygen, brighter red color, or • low in oxygen, darker red color. (purple) • The skin changes the way blood looks in the veins to make it look bluer in color.
Right Side • The Patient’s Right Side of the Heart • Blood is returning to the heart from it’s trip around the body. • Returns to the heart through the Vena Cava • Condition of the blood: • High in Carbon Dioxide • Low in Oxygen
Right Side • Right Atrium (RA) • Collecting chamber for blood returning to the heart from the body. • Right Ventricle (RV) • Pumping chamber – sends blood to the lungs. • A valve separates the two chambers and prevents blood from flowing backwards. 1. 2.
Right Side • Blood leaves the heart, through the pulmonary arteries. • Drops off waste gas carbon dioxide. • Picks up new supply of oxygen. 4. Returns to the heart through the pulmonary veins. 3. 3. 4. 4.
Left Side • The Patient’s Left Side of the Heart • Blood is returning to the heart from it’s trip to the lungs. • Condition of the blood: • High in Oxygen • Low in Carbon Dioxide
Left Side • Left Atrium (LA) • Collecting chamber for blood coming back to the heart from the lungs. • Left Ventricle (LV) • Pumping chamber – pumps blood to the rest of the body. • Six times more powerful than the right ventricle. 5. 6.
Leaving the Heart To the Head/Upper Body • Blood leaves the heart through the largest and strongest blood vessel in the body – Aorta 7. Pump Your Blood – Happy Days (4:09 min) To the Lower Body