Lesson 2A Flashcards
What is hemodynamics
Basic principles of the dynamics of blood circulation
- factors that influence blood flow
- what helps it to flow/what hinders the flow
- understanading the normal physiology of blood circulation
Are hemodynamics the same for arterial and venous flow?
No
What are the tiniest blood vessels
Capillaries
At what point do we say a vein or artery is a artiole of venule ?
Too small to be seen by the naked eye
Which has thicker tunica media, artery or vein
Artery
What does a thicker tunica media allow for (2)
Greater elasticity and non collapsible (strength)
Do arteries have valves
No
Are arteries high or low pressure system
High
Veins can be described as highly _____
Tensile
Venous system is high or low pressure
Low
Does venous circulation have valves
Yes
Why do we put needles in veins instead of arteries
Thinner walls so easier and less painful
Less blood pressure
Veins store blood so it is much more readily available
What do valves do
Prevent backflow
Stores the blood for when its not moving
Helps project blood when trying to move it
What characteristic do we see in the vein where the valve is
Wider diament
What period do the valves prevent backflow
Diastole
Momentum from _______ forces valves open
Systole
When do the valves close
When momentum decreases
What moves blood forward into the RT atrium
Decrease in thoracic pressure
Venous flow differs depending on
Location from the heart
Closer to the heart we see more ____ flow
Pulsatile
Pulsatile flow shows what wave form
Large and spread out
Ex. Hepatic veins
Non pulsatile waveforms show
Constant white bar with no continous divets
Semi pulsatile flow shows what wave form
Close together almost continous flow but with slight pulses shown
Low resistant beds produce what kind of wave form
What about high resistant
High =high resistant waveform
Low= low resistant waveform
Ex of low resistant bed and why
Brain—> constantly needs blood flow
Example of high resistant bed and why
Femor —> when not excercising does not need as high a flow
