Blood Pressure Flashcards
Why is blood pressure higher in left side of the heart?
Due to being pumped out to whole body, if pressure same the flow stops
When LV fully relaxed the pressure is at…?
5mmHg - always same pressure between beats
From LV to aorta pressure doesn’t drop further than…?
80mmHg
Pressure decreases as blood flows through…? (Each step)
Ventricles –> arteries–> arterioles –> capillaries–> venules, veins –> atrium
LV contracts from 5mmHg to…
…120mmHg in milliseconds
Poiseuille law: Q=pixdeltaPxrx4/8nl Q? Delta P? Eta (n) 8? l?
Q is the flow Delta P is the pressure gradient Eta (n) is viscosity 8 is the constant l is the length
What’s meant by vasoconstriction?
Narrowing of a vessel;
(Increased contraction of circular smooth muscle in the arterial wall, leading to increased resistance and decreased flow through the vessel)
What does vasoconstriction lead to?
leading to increased resistance and decreased flow through the vessel
What is meant by vasodilation?
Refers to the enlargement in the circumference and radius of a vessel as a result of its smooth muscle layer relaxing
What does vasodilation lead to?
Decreased resistance and increased flow through that vessel
What is cardiac output?
Volume of blood pumped by each ventricle per minute
Not total amount of blood pumped by heart
What is stroke volume?
Volume of blood pumped per beat or stroke)
Cardiac output =?
CO=heart stroke x stroke volume
What is the mean arterial pressure?
It is the average pressure driving blood forward into the tissues throughout the cardiac cycle
Mean arterial pressure =?
Mean arterial pressure = diastolic pressure + 1/3 pulse pressure
(At 120/80, mean arterial pressure = 80 mmHg + (1/3) 40 mmHg = 90 mmHg)
