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Composition: • Heart: The organ that pumps the blood throughout the body • Veins: Transports oxygen deficient blood to heart and lungs • Arteries: Transports oxygen rich blood throughout the body • Blood: The fluid consisting of plasma, blood cells, and platelets that is circulated by the Human heart - Download as a PDF or view online for free. The circulatory system uses the heart to pump blood through vessels around the body. Figure 1-2(f) An Image/Link below is provided (as is) to download presentation Download Policy: Introduction • The cardiovascular system (CVS) is a closed system in • which the blood circulates throughout the body. 3-14-05 Normal SA Node & Intranodal Atrial Tract Changes Physiological changes Irritability of the myocardium may result in extra systoles, along with sinus arrhythmias & sinus bradycardia Chapter 18, Cardiovascular System 62 Sympathetic nervous system (SNS) stimulation is activated by stress, anxiety, excitement, or exercise Parasympathetic nervous system (PNS) stimulation is mediated by acetylcholine and opposes the SNS PNS dominates the autonomic stimulation, slowing heart rate and causing vagal tone If the Vagus Nerve was cut, 11. <break><break>This medical PowerPoint presentation talks about the cardiovascular system. It also discusses the cardiac conduction system, including the sinoatrial node, atrioventricular node, bundle of His, and Purkinje fibers. 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