Cardiovascular Physiology 19 Flashcards
What does Compliance describe?
How easily a chamber of the heart or the lumen of a blood vessel expands when it is filled with a volume of blood
What is the formula for Compliance?
𝛥Volume/𝛥Pressure
What would occur if you injected a volume into a rigid tube?
You could technically increase the pressure to infinity without increasing the volume in the tube
How would a tube with infinite compliance work?
You could technically add an infinite volume to the tube without changing the pressure
What kind of compliance do the walls of blood vessels have?
They have finite compliance
What do tubes with finite compliance do?
The volume would increase by the same amount injected and the pressure would also increase
What is the rule for the compliance of a vessel?
The change in pressure that occurs with a change in volume is greater if the compliance of the vessel is lower
What is Blood pressure determined by?
The volume of the blood in the vessels and the compliance of the vessels
What is the Windkessel effect?
A term used in medicine to describe the recoiling effect of large arteries
When do large arteries increase and decrease their diameters?
They increase their diameters during systole and decrease during diastole
What is Transmural Pressure?
The difference in pressure between the two sides of a wall. The pressure difference between the inside wall of a blood vessel and the outside wall of a blood vessel
What distends the aorta walls and increases arterial pressure?
The blood that remains in the artery after the rest has left the artery to go other vessels
What causes arterial walls to recoil passively?
The heart entering diastole
What occurs in the large blood vessels once the heart enters diastole?
The remaining blood in the vessel moves down as the vessel recoils passively
Why is elastic recoil of blood vessels important?
Because it maintains perfusion of blood vessels when the heart is in diastole
