Circulatory Systems

Circulatory Systems - Circulatory Systems What does the...

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1 Circulatory Systems What does the circulatory system really do? Open vs. Closed • Open circulatory systems • Do they serve the same purpose as a closed circulatory system? • Let’s see how they are different closed Follow the trail of deoxygenated blood fish Lungfish
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2 Amphibians and Reptiles Birds and Mammals Blood Flow Through and Pump Action of the Heart
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3 Cardiac cycle Cardiac Muscle Fibers • Interconnected by intercalated discs and form functional syncytia • Within intercalated discs – two kinds of membrane junctions Electrical Activity of Heart • Heart beats rhythmically as result of action potentials it generates by itself (autorhythmicity) • Two specialized types of cardiac muscle cells – Contractile cells – Autorhythmic cells
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4 Specialized Conduction System of Heart Pacemaker Higher resting potential Spread of Cardiac Excitation Action Potential
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5 Electrocardiogram (ECG) Different parts of ECG record can be correlated to specific cardiac events Blood and Blood Flow • Blood is a connective tissue • Blood is constantly reconditioned so
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Circulatory Systems - Circulatory Systems What does the...

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