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  1. 6.2.U8The heart beat is initiated by a group of specialized muscle cells in the right atrium called the sinoatrial node. AND 6.2.U9 The sinoatrial node acts as a pacemaker. AND 6.2.U10 The sinoatrial node sends out an electrical signal that stimulates contraction as it is propagated through the walls of the atria and then the walls of the ventricles. http://www2.estrellamountain.edu/faculty/farabee/Biobk/heartbeat.gif Myogenic initiation of the contraction means that the heart does not stop beating – it is not a conscious process.

  2. 6.2.U11 The heart rate can be increased or decreased by impulses brought to the heart through two nerves from the medulla of the brain. AND 6.2.U12 Epinephrine increases the heart rate to prepare for vigorous physical activity. http://goo.gl/YeoeJ n.b. adrenalin is also known as epinephrine Electrical system of the heart http://medmovie.com/library_id/7556/topic/cvml_0005a/

  3. 6.2.A2 Pressure changes in the left atrium, left ventricle and aorta during the cardiac cycle. SL valves AV valves

  4. An electrocardiogram (ECG) is a test that • It can be used to determine if electrical activity is normal and it may be used to determine if parts of the heart are too large or overworked.

  5. http://4.bp.blogspot.com/_5Nslwo9F6bI/S_EU-Kcs4DI/AAAAAAAAAg4/5f0VSazrcN4/s1600/ECG+trace+%26+basics.jpghttp://4.bp.blogspot.com/_5Nslwo9F6bI/S_EU-Kcs4DI/AAAAAAAAAg4/5f0VSazrcN4/s1600/ECG+trace+%26+basics.jpg

  6. 6.2.A2 Pressure changes in the left atrium, left ventricle and aorta during the cardiac cycle. 1 2 3 4 *DUB *LUB *Heart sounds 5 *Ventricular systole

  7. 6.2.A3 Causes and consequences of occlusion of the coronary arteries. http://www.hhmi.org/biointeractive/obesity/heart_attack.html

  8. 6.2.A3 Causes and consequences of occlusion of the coronary arteries. http://www.webmd.com/heart/video/coronary-bypass

  9. 6.2.A3 Causes and consequences of occlusion of the coronary arteries. • Treatment for atherosclerosis includes: • Lifestyle changes: • to lower cholesterol if lifestyle changes are not enough • Severe atherosclerosis may require medical procedure or surgery (such as bypass)

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