Vasculature Flashcards
What is laminar blood flow?
When blood follows a smooth path and does not interefere with each other (opposite of turbulent flow)
Which layer of blood flows the fastest in blood vessels which have a laminar flow?
The middle most layer
What are thixotropic fluids?
fluid’s viscosity is dependant on flow
How are Korotkoff sounds generated?
Through artificially generating turbulent flow
What is LaPlace’s law?
The larger the vessel radius, the larger the wall tension required to withstand a given internal fluid pressure.
What are metarterioles?
Links arterioles to venules, discontinuous smooth muscle
What is vasomotion?
The spontaneous oscillating contraction of blood vessel walls, independent of heart beat, innervation or respiration
What regulates blood tissue flow?
- Active and reactive hyperemia
- Flow autoregulation
- Vasomotion
- Response to injury
What is the difference between active and reactive hyperaemia?
- Active hyperaemia is due to a tissue being highly active thus inducing blood flow whereas reactive is due to blood supply being blocked
- Active: blood flow increases ~ 20x
- Reactive: blood flow increases ~ 4-7x
How do you calculate Mean Arterial blood pressure?
Diastolic blood pressure + 1/3 pulse pressure
How do you calculate pulse pressure?
Systolic pressure - diastolic pressure
How do you calculate arterial pressure?
Cardiac output x total peripheral resistance
