sinoatrial node AND 62U9 The sinoatrial node acts as a pacemaker AND 62U10 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 ID: 781420
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Slide1
6.2.U8 The 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.
Slide26.2.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.
n.b.
adrenalin is also known as epinephrine
http://goo.gl/
YeoeJ
Electrical system of the
heart
http
://medmovie.com/library_id/7556/topic/cvml_0005a
/
Slide36.2.A2 Pressure changes in the left atrium, left ventricle and aorta during the cardiac cycle.
AV valves
SL valves
Slide4An electrocardiogram (ECG) is a test that measures the electrical activity of the heartbeatIt 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.
Slide5Slide6http://4.bp.blogspot.com/_5Nslwo9F6bI/S_EU-Kcs4DI/AAAAAAAAAg4/5f0VSazrcN4/s1600/ECG+trace+%26+basics.jpg
Slide76.2.A2 Pressure changes in the left atrium, left ventricle and aorta during the cardiac cycle.
Slide8Slide96.2.A3 Causes and consequences of occlusion of the coronary arteries.
http://www.hhmi.org/biointeractive/obesity/heart_attack.html
Slide106.2.A3 Causes and consequences of occlusion of the coronary arteries.
http://
www.webmd.com/heart/video/coronary-bypass
Slide116.2.A3 Causes and consequences of occlusion of the coronary arteries.