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Download Circulatory system
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Transcript
The Circulatory System The Heart vein 2 atria 2 ventricles arteries Anatomy of the Heart The Heart Artery to Lungs Vein from Head and Body Artery to Head and Body Vein from Lungs How does the Heart work? relax How does the Heart work? contract open How does the Heart work? close contract relaxing Electrical Conduction System Electrocardiogram P wave = Depolarization of atria QRS wave = Depolarization of ventricles T wave = Repolarization of ventricles the “bypass graft” enables blood to reach your heart by flowing The ARTERY Arteries carry blood away from the heart. stretch thick muscle and elastic fibres push The VEIN Veins carry blood towards from the heart. thin muscle and elastic fibres The CAPILLARY Capillaries link Arteries with Veins the wall of a capillary is only one cell thick The CAPILLARY capillary bed what’s in The Blood Red Blood Cells haemoglobin nucleus without a change shape White Blood Cells big nucleus lymphocytes macrophages „eat‟ and digest antibodies antitoxins Platelets Platelets fibrinogen fibres blood Plasma • strawcoloured • • • • • • • urea SUMMARY away muscular towards capillaries plasma oxygen platelets
