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
