THE HEART Unit 3: Transportation and Respiration
The Circulatory System Also called the Cardiovascular System Circulates blood in the body Transports nutrients, oxygen, carbon dioxide, hormones, and blood cells to and from cells in the body Helps fight diseases Stabilizes body temperature Helps maintain homeostasis
Is blood ever blue?
The Heart Muscular double pump About the size of a fist Composed of cardiac muscle tissue The right side pumps deoxygenated blood to the lungs The left side pumps oxygenated blood to the body Right Side Left Side
The Heart Two pathways of circulation Pulmonary Circulation eliminates carbon dioxide and oxygenates blood (lung pathway) Systemic Circulation delivers blood to all body cells and carries away waste Left Side
Structures of the Heart Pericardium Tough membrane that covers the heart and protects it
Structures of the Heart Septum Separates the left and right sides of the heart Prevents the oxygen-rich blood from the left side from mixing with the oxygen-poor blood from the right side
Structures of the Heart Atria (singular: atrium) Two upper chambers Right atrium receives deoxygenated blood from the body Left atrium receives oxygenated blood from the lungs
Right Atrium Left Atrium
Structures of the Heart Superior Vena Cava Large vein Empties deoxygenated blood into right atrium Returns blood from head, chest, arms Inferior Vena Cava Large vein Empties deoxygenated blood into right atrium Returns blood from lower body regions
Superior Vena Cava Inferior Vena Cava
Structures of the Heart Ventricles Two lower chambers Right ventricle sends deoxygenated blood to the lungs through the pulmonary arteries Left ventricle sends oxygenated blood to the body through the aorta
Right Ventricle Left Ventricle
Structures of the Heart Pulmonary Arteries Send deoxygenated blood from right ventricle to lungs
Right Pulmonary Artery Left Pulmonary Artery
Structures of the Heart Pulmonary Veins Carry oxygenated blood from lungs to left atrium
Right Pulmonary Veins Left Pulmonary Veins
Structures of the Heart Aorta Largest artery in the body Sends oxygenated blood from the left ventricle to the body Branches and divides into many smaller arteries
Aorta Aorta
Atrioventricular Valves (A-V valves) Control the direction of blood flow from the atria into the ventricles A-V valve in the right side=tricuspid valve because it has 3 flaps A-V valve in the left side=bicuspid valve or mitral valve
Structures of the Heart Semilunar Valves When open allow blood to flow from the ventricles into the arteries that carry blood away from the heart When closed stop blood from flowing back into the ventricles
It s always right to try! Tricuspid Valve Mitral (Bicuspid) Valve
Pulmonary Valve Aortic Valve
http://highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=swf::500::500::/s ites/dl/free/0077353064/667029/pulmonaryandsystemiccirculation.swf::pulmo nary%20and%20systemic%20circulation
Exit Slip Why do you think the left ventricle is more muscular than the right ventricle?
Aorta Superior Vena Cava Left Pulmonary Artery Right Pulmonary Artery Right Pulmonary Veins Left Pulmonary Veins Right Atrium Tricuspid Valve Right Ventricle Inferior Vena Cava Left Ventricle Mitral (Bicuspid) Valve Aortic Valve Left Ventricle Aorta
Blood Flow Review https://www.youtube.com/watch?v=ja0wb3gc4me&feature=related
Make a prediction What would happen if there were no valves in the veins capillaries had muscular walls https://www.healthline.com/health/artery-vs-vein#anatomy