330-7 - Cardiovascular Control During Exercise...

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Cardiovascular Control During Exercise
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Cardiovascular Functions Delivery Oxygen and nutrients Removal CO2 and metabolic wastes Transport hormones Maintenance Body temperature Fluid leves and pH Prevention infection
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The Heart Blood flow through the heart (fig 8.1) The myocardium interconnected cardiac muscle hypertrophy of left ventrical The cardiac conduction system (fig 8.3) Autoconduction : the ability to generate its own electrical signal rythmically without neural stimuation. SA node : (pacemaker) sends the electrical impulse to the atria and reaches the AV node. AV node : conducts the impulse from the atria into the ventricals through the . ... AV bundle and Perkinji fibers where it travels along the septum and to the ventrical walls starting at the Apex .
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The Heart Extrinsic control of heart activity the parasympathetic nervous system decreases H.R. & force of heart contraction the sympathetic nervous system increases H.R. & force of heart contraction the endocrine system: release norepinephrine and epinephrine to increase H.R. The ECG (fig 8.4) records the electrical activity of the heart the P wave : atrial depolarization the QRS complex : ventricular depolarization the T wave : ventricular repolarization
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330-7 - Cardiovascular Control During Exercise...

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