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PEDS200 (38)

Chapter 10 - Cardiovascular System And Exercise

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University of Alberta
Physical Education and Sport
Dan Syrotuik

Cardiovascular System and ExerciseChapter 10 The CV system is involved in y Transport of O2 and CO2 y Supply nutrients ex Substrates H2O minerals etc y Circulation of compounds such as hormones y Waste removal ex urea y Regulation of blood flow y ThermoregulationControl of the CV System y at rest the heart has an intrinsicpacemaker activity as well as being under CNS controly Specialized cells called the sinoatrial node SA in rear of right atrium haveleaky ionschannels to sodium and calcium that result in spontaneous depolarization after repolarization y SA impulse spreads across atria and causes depolarization of another specialized heart muscle cell area the atrioventricular node AV which slows the transmission of the impulse to allow blood to empty from atria y Depolarization spreads down more specialized cells bundle of His to purkinje fibers that stimulate ventricle muscle fibers to contractResult y Coordinated contraction of heart musculature to allow filling and emptying of bloodHeart Rate HR 7075 bpm Stroke Volume SV 6070 ml per beat Cardiac Output Q45005000 mlmin Blood Pressure 12080 mmHg systolicdiastolicControl Of The CV System1 Autonomous Nervous System A Sympathetic control stimulates via release of norepinephrine from sympathetic nerve endings increase in HR SV and Q B Parasympathetic control release of acetylcholine from nerve endings decrease in HR SV and Q
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