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Lecture 13

Lecture 13 - Feb 11th.docx

2 Pages

Kinesiology & Health Science
Course Code
KINE 3012
Tara Haas

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Page 69 - In order for bulk flow, we require pressure, which is generated by muscle contraction Page 70 - Extra slides Page 20 Systole - Every heart cycle has a systole and diastole - Divided into 2 phases, follows the QRS complex - When muscles squeeze on the blood, pressure rises above the atrium - Blood tries to flow back into the atrium from the ventricle - All valves are closed, - Isometric ventricular, the muscles generate force but there is no movement/heart doesn't get smaller, similar to isometric contraction in skeletal muscles - Ventricular ejection, ventricles pull up and get smaller and eject blood into the pulmonary artery/aorta Diastole - Isovolumetric ventricular relaxation *boyle's law* Pressure inside is still high, as the muscles relax, volume in ventricles increase until the pressure in the ventricles are lower than the atrium - Ventricular filling, blood comes into the heart from atrium, pulmonary artery and aorta Page 71 - Half the time in heart beats are spend in filling - Middle, pressure - Bottom, ventricular volume - Before QRS complex, pressure of ventricular is less than atria - First sound = closing of the AV valve - Pressure increases above the aorta, and blood is ejected - T wave, ventricles starting to relax - When ventricles relax, pressure begins to drop lower than aortic pressure - Aortic valve closes *second sound of heart beat* - Pressure in the ventricle drops below of the atria, the AV valves open and blood begins to fill the ventricles - The ventricle filling phase takes a long time - When ventricular pressure < atrial pressure, AV valves open and blood flows into the ventricle - When ventricular pre
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