Dr. White

Dr. White - Anatomy and Physiology Heart Lungs Pancreas...

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Anatomy and Physiology Heart, Lungs, Pancreas, Liver, Kidneys and Skin B. Paul White, MD HOD ID#: 2078
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HEART
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HEART Hollow, muscular organ 300 grams (size of a fist) 4 chambers found in chest between lungs surrounded by membrane called Pericardium Pericardial space is fluid-filled to nourish and protect the heart.
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HEART ANATOMY The heart is a complex muscular pump that maintains blood pressure and flow through the lungs and the rest of the body. The heart pumps about 100,000 times and moves 7200 liters (1900 gallons) of blood every day .
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HEART ANATOMY The heart has four chambers. Two  atria  act  as  collecting  reservoirs. Two ventricles act as pumps. The heart has four valves for:  Pumping action of the heart.  Maintaining unidirectional  blood flow.
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Functions of the Heart Generates blood pressure Routes blood Heart separates pulmonary and systemic circulation Ensures one-way blood flow Heart valves ensure one-way flow
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Functions of the Heart Regulates blood supply Changes in contraction rate and force match blood delivery to changing metabolic needs Most healthy people can increase cardiac output by 300–500% Heart failure is the inability of the heart to provide enough blood flow to maintain normal metabolism
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Cardiac Cycle The heart is two pumps that work together, right ( pulmonary ) and left ( systemic ) half Repetitive, sequential contraction ( systole ) and relaxation ( diastole ) of heart chambers Blood moves through circulatory system from areas of higher to lower pressure. Contraction of heart produces the pressure
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Cardiac Cycle
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HEART Deoxygenated blood returns to the heart via the superior and inferior vena cava, enters the right atrium, passes into the right ventricle, and from here it is ejected to the pulmonary artery. Oxygenated blood returning from the lungs enters the left atrium via the pulmonary veins, passes into the left ventricle, and is then ejected to the aorta.
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Blood Vessels Blood vessels are divided into a pulmonary circuit and systemic circuit. Artery - vessel that carries blood away from the heart. Usually oxygenated Vein - vessel that carries blood towards the heart. Usually deoxygenated. Capillary - a small blood vessel that allow diffusion of gases, nutrients and wastes between plasma and interstitial fluid.
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Blood Vessels Systemic vessels Transport blood through the body part from left ventricle and back to right atrium Pulmonary vessels Transport blood from right ventricle through lungs and back to left atrium Blood vessels and heart are regulated to ensure blood pressure is high enough for blood flow to meet metabolic needs of tissues
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Blood Flow
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LUNGS Lungs comprised of Airways Alveoli http://www.aduk.org.uk/gfx/lungs.jpg
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Primary function is gas exchange
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Dr. White - Anatomy and Physiology Heart Lungs Pancreas...

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