Overview of CVS Flashcards
What does the bulk flow system of the CVS allow transport of?
O2 and CO2 Nutrients Metabolites Hormones Heat
What allows flexibility?
Vary output
Vessels can redirect blood
Vessels can store blood
How are the pumps structured?
In series (therefore output must be equal)
How are most of the vascular beds structured?
In parallel
What are 2 benefits of parallel structure of vascular beds?
All tissue gets oxygenated
Allows regional redirection of blood
There are exceptions
How do you work of the pressure difference?
MAP - CVP
How do you work out the resistance?
Radius^4
What is the equation to determine flow?
Flow = pressure difference / resistance
How vessel control resistance?
Arterioles - the ‘taps’ controlling resistance (and therefore flow) to each vascular bed
What type of vessel is the aorta and what is its function?
Elastic artery
Wide lumen, elastic wall
Damp pressure variations
What type of vessel are the arteries and what is their function?
Muscular artery
Wide lumen, strong non-elastic wall
Low resistance conduit
What type of vessel are the arterioles and what is the function?
Resistance vessels
Narrow lumen, thick contractile wall
Control resistance and therefore flow
Allow regional redirection of blood
What type of vessel are the capillaries?
Exchange vessels
Narrow lumen, thin wall
What type of vessel are the venues and veins and is the function?
Capacitance vessels
Wide lumen, distensible wall
Low resistance conduit and reservoir
Allow fractional distribution of blood between veins and rest of circulation as 3/4 of blood is stored there (so during exercise blood can be released)
