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BCH1048 Tutorial 9 - The Heartbeat The Nodal tissue has...

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The Heartbeat The Heartbeat (pacemaker) (pacemaker) The rhythmic contraction of the heart is due to the cardiac conduction system cardiac conduction system . Nodal tissue: Nodal tissue: has both muscular & nervous characteristics Excitation impulse Prior to atrial contraction Prior to ventricular contraction Ventricles are recovering from contraction Electrocardiogram (EGC) Electrocardiogram (EGC) ] ] H ˚ \ h ° ° H ˚ \ h ° °
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An EGC is a recording of the electrical changes electrical changes that occur in myocardium ( ( ° °) during a cardiac cycle. Body fluids contain ions ions ( ( ° ) that conduct electrical currents, and therefore the electrical changes in myocardium can be detected on the skin’s skin’s surface surface . Electrocardiogram (EGC) Electrocardiogram (EGC)
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Uncoordinated contraction of the ventricles; Can be caused by an injury or drug overdose; Most common cause of sudden cardiac death in a seemingly healthy person; Ventricular fibrillation ( Ventricular fibrillation ( H˚ \ „ “ * ° ±² ³ ‚ “ * ° ) ) Defibrillation ( ±² ³ “ D ) of fibrillated ventricles is done by applying a strong electric current for a short period of time.
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Two genes are involved: Persons with hypertension may be due to over- over- expression expression of these genes. Cardiovascular disorders Cardiovascular disorders Hypertension ( Hypertension ( H˚ \ h° ° ) ) Silent killer Silent killer (may be not detected until a stroke ( ° or heart attack ( ( ° ° ° occurs); Its development is believed to be related to genetic makeup genetic makeup ; Angiotensinogen (1st gene product) (1st gene product) Vasoconstrictor 2nd gene product 2nd gene product
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Cardiovascular disorders Cardiovascular disorders Atherosclerosis ( Atherosclerosis ( H ˚ \ „ “
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