A&P II Notes Feb 22

A&P II Notes Feb 22 - Anatomy & Physiology II...

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Heart Electrical activity leads to the mechanical activity (contraction) Mechanical activity involves a period of contraction (systole) and a period of relaxation (diastole  – lasts slightly longer) Blood pressure – measured using a sphygmomanometer and a stethoscope, read in mmHg Cuff is pumped up to ~180 mmHg and blood flow down the brachial artery stops, pressure is  slowly released and you hear a sound that is the beginning of the flow of blood through the  artery again – read the sphygmomanometer and that number is the systolic pressure, keep  opening the pressure valve and you stop hearing the sound – diastolic pressure Systolic pressure – higher number, textbook figure is 115 or 120 Diastolic pressure – 75 or 80, blood is freely-flowing from atria to the ventricles The way the heart beats:  1.
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A&P II Notes Feb 22 - Anatomy & Physiology II...

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