blood pressure
TRANSCRIPT
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Notes: Blood Pressure (pg 8)
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Notes: Blood Pressure
• Systole = Ventricles contracting• Diastole = Ventricles relaxed
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Blood Pressure• If your blood vessels were completely rigid
then blood pressure would spike very high during systole and drop to zero during diastole
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Blood Pressure• If your blood vessels were completely rigid
then blood pressure would spike very high during systole and drop to zero during diastole
• Luckily, our vessels are elastic
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Blood Pressure• If your blood vessels were completely rigid
then blood pressure would spike very high during systole and drop to zero during diastole
• Luckily, our vessels are elastic• During Systole: vessels stretch (widen),
absorbing some of the pumping force. BP is high, but not nearly as high as it would be with rigid vessels
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Blood Pressure• If your blood vessels were completely rigid then
blood pressure would spike very high during systole and drop to zero during diastole
• Luckily, our vessels are elastic• During Systole: vessels stretch (widen),
absorbing some of the pumping force. BP is high, but not nearly as high as it would be with rigid vessels
• During Diastole: Stretched vessels gradually return to normal size, keeping some pressure on the blood. BP is low, but not zero.
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me
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Blood Pressure Reading
• Two numbers (Example: 120 / 80)• Higher number = Systolic. Pressure when
ventricles are contracting• Lower number = Diastolic. Pressure when
ventricles are relaxed
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Factors that affect blood pressure
1. Cardiac output (heart rate x stroke volume)
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Factors that affect blood pressure
1. Cardiac output (heart rate x stroke volume)2. Blood volume
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Factors that affect blood pressure
1. Cardiac output (heart rate x stroke volume)2. Blood volume3. Resistance (vasoconstriction, atherosclerosis)
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Factors that affect blood pressure
1. Cardiac output (heart rate x stroke volume)2. Blood volume3. Resistance (vasoconstriction, atherosclerosis)4. Viscosity of blood