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TPR = MAP/CO Compression creates negative transmural pressure
creates negative transmural pressure Gradual Decrease in Pressure
Decrease in Pressure Flow through open vessel generates turbulence
Korotkoff Sound – sound from turbulence Systolic Pressure – first sound heard, peak pressure in
Diastolic Pressure – when the ‘whooshing’ sound
disappears The Arterial Baroreceptor Reflex Effect
Effect of Posture on Blood Pressure Why do we sometimes feel dizzy for a couple of
seconds if we stand up to quickly?
Shift from supine to upright: Gravity forces blood to pool in the lower leg veins
Veins distend – shift in blood volume away from the
chest and head towards the lower legs
Decrease in Venous Return – Leads to Decrease in
Stroke Volume and a Decrease in Arterial Pressure
Stroke Volume and Decrease in Arterial Pressure
Decrease in Arterial Pressure can result in
inadequate cerebral blood flow How does the body return the blood pressure to
a normal level? Reflex – negative feedback, prevents large
changes in MAP despite changes in the heart or
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This document was uploaded on 01/13/2014.
- Winter '14