Overview of the Function of the CVS 1 Flashcards
Define the function of the cardiovascular system
(TO SUPPLY THE BRAIN WITH OXYGEN!)
Transports:
- O2 and CO2
- Nutrients
- Metabolites
- Hormones
in CVS pumps are equal, therefore:
Output must be equal
Indicate the significance of vascular beds being arranged in parallel or in series
Pumps ensure output is equal
Parallel ensures
- all tissue get oxygenated blood
- all regional redirection of blood
Pressure difference =
mean arterial pressure - central venous pressure
FLOW = ?
Total pressure / Resistance
What is the function of arteriole vessels?
To act as ‘taps’, controlling resistance (and therefore flow) to each vascular bed
2 properties of aorta
- Thick elastic wall
- Wide lumen
3 properties of arteries
- Muscular arteries
- Wide lumen
- Strong, thick, non-elastic wall
5 properties of arterioles
- Resistance vessels
- Narrow lumen
- Thick contractile wall
- Control resistance and therefore flow
- Allow regional redirection of blood
3 properties of capillaries
- Exchange vessels
- Narrow lumen
- Thin wall
4 properties of venules and veins
- Capacitance vessels
- Wide lumen
- Thin, distensible wall
- Allows fractional distribution of blood between veins and rest of circulation
Define myocardium
‘muscle of the heart’
