The Cirulatory and Rispiratory outline

The Cirulatory and - The Circulatory and The Respiratory Systems Chapter 49 http/www.youtube.com/watch?v=1tvADfnJY38&feature=related Sponges

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The Circulatory and The Circulatory and Respiratory Systems Respiratory Systems Chapter 49 Chapter 49 http://www.youtube.com/watch?v=1tvADfnJY38&feature=related
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Sponges, cnidarians, & nematodes lack a (true) separate circulatory system Nematode’s Hydra Sponges
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Open circulatory system Fluid called hemolymph Closed circulatory system
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Vertebrates Circulatory Systems Vertebrates Circulatory Systems Fishes evolved a true chamber-pump heart 1. 1. 2. 2. 3. 3. 4. 4. Four chambers: Four chambers:
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Amphibian Amphibian The advent of lungs in amphibians required a 2 nd pumping circuit, or double circulation • Pulmonary circulation • Systemic circulation 5 Frog: 3 chambers: Frog: 3 chambers:
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Vertebrate Circulatory Systems Vertebrate Circulatory Systems 6
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Birds and Mammals Birds and Mammals Mammals, birds & crocodilians have a 4 4 - - chambered chambered Right atrium Left atrium 7
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The Cardiac Cycle The Cardiac Cycle The heart has 2 pairs of valves Atrioventricular (AV) valves Semilunar valves 8
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The Cardiac Cycle The Cardiac Cycle –Diastole = Rest –Systole = Contraction • Right and left pulmonary arteries deliver deoxygenated blood from the right ventricle to the right and left lungs 9
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The Cardiac Cycle The Cardiac Cycle • The aorta & all its branches are systemic arteries , carrying oxygen-rich blood from the left ventricle to all parts of the body Coronary arteries supply the heart muscle itself • Superior vena cava • Inferior vena cava 10
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Arterial blood pressure can be measured with a sphygmomanometer Blood pressure = systolic /diastolic pressure Here BP=120/75 Systolic pressure Diastolic pressure 11
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Contraction of Heart Muscle Contraction of Heart Muscle • Contraction of the heart muscle is stimulated by membrane depolarization • The SA node acts as a pacemaker for rest of the heart • Produces spontaneous action potentials faster than other cells 12
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Contraction of Heart Muscle Contraction of Heart Muscle • Depolarization travels to the muscle fibers of the left atria and to the atrioventricular (AV) node in the right atrium – It is then conducted rapidly over both ventricles by a network of fibers called the atrioventricular bundle, or bundle of His 13
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Muscle Contraction of Heart Muscle Contraction of Heart 1st peak (P) is produced by depolarization of atria (atrial systole) 2 nd larger peak (QRS) is produced by ventricular depolarization (ventricular systole) Last peak (T) is produced by repolarization of ventricles (ventricular diastole)
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1. The impulse begins at the SA node & travels to the AV node
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This note was uploaded on 06/13/2011 for the course BIO 1500 taught by Professor Pandolfi during the Winter '08 term at Wayne State University.

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The Cirulatory and - The Circulatory and The Respiratory Systems Chapter 49 http/www.youtube.com/watch?v=1tvADfnJY38&feature=related Sponges

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