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The Mechanical Functions of the Heart

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Kendall Fisher

on 16 October 2012

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Transcript of The Mechanical Functions of the Heart

By Kendall Fisher, Brittany Flynn,
Tara Zorb, Leah Nicholas, and Laura Cicigoi The Mechanical Functions
of the Heart Left & Right Atrium
They are low-pressure chambers with thin walls, that serve as storage units & conduits for blood that is emptied into the ventricles
(Atrium's are separated by interatrial septum) Chambers of the Heart Atrioventricular valves: valves open and blood flows from atria to relaxed ventricles. Valves of the Heart
Right atrium receives deoxygenated blood from superior/inferior vena cava
Deoxygenated blood leaves right ventricle via pulmonary artery
Pulmonary artery carries blood to the lungs where there is an exchange of gases that oxygenates theblood
Pulmonary veins returns oxygenated blood into the left atrium
Aorta pumps bloods out into the circulation of the body Vessels of the Heart 1. During diastole (relaxation), blood flows into atria, AV valves are pushed open, and blood begins to fill ventricles.
2. Atrial contraction squeezes any blood remaining in atria out into ventricles.
3. During ventricular systole, ventricles contract, pushing blood out through semilunar valves into the pulmonary artery (right ventricle) and aorta (left ventricle)
Each ventricular contraction and relaxation that follows is one cardiac cycle The Cardiac Cycle Left & Right Ventricle
Right Ventricle: Ejects a large amount of blood through a very small valve into the low-pulmonary system.
Left ventricle: Is larger than the right helping to eject blood through a large valve opening into the high-pressure systemic circulation
(Ventricle's are separated by interventricular septum) Deoxygenated blood begins to fill the
Right Atrium.
Right AV valve, Right ventricle, Pulmonary Semilunar valve, Lungs
Oxygenated Lungs return via Pulmonary veins into Left atrium.
Left AV valve, Left ventricle, Aortic Semilunar valve, Aorta, Body. Blood Flow Pathway Cardiac Cycle Animation The Cardiac Cycle Semilunar valves: blood flows out of ventricles into pulmonary and systemic circulations
Opens when intraventricular pressure exceeds aortic and pulmonary pressures Pulmonic and Aortic semilunar valves: Prevents backflow into left and right ventricles.
After ventricular contraction and ejection, intraventricular pressure falls causing valves to close Tricuspic valve
Right atrioventricular
valve Mitral valve
Left atrioventricular
valve The Heart Pumps blood to every part of the body
About the size of a fist
Weighs less than 1lb. Valves & Chambers 1. What vessel returns oxygenated blood from the lungs to the left atrium?
A. Aortic veins B. Pulmonary arteries
C. Pulmonary veins D. Aorta

2. What valve(s) control blood flow from the atrium to the ventricles? (Hint: they also prevent backflow)
A. Papillary muscles B. Tricuspid/Mitral valves
C. Pulmonic/Aortic semilunar valves D. Bicuspid valve

3. What vessel(s) receive deoxygenated blood from the systemic circulation into the right atrium?
A. Superior/Inferior vena cava B. Aortic arch
C. Chordae tendinae D. Left/Right pulmonary vein Questions to Answer Coronary Arteries supply blood to heart muscles & branch to become arterioles and capillaries Lymphatic Vessels carry fluid to lymph nodes in the mediastinum. These are important for protecting the heart walls against injury
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