1/ overview of the CV block Flashcards Preview

S2 Cardiovascular System > 1/ overview of the CV block > Flashcards

Flashcards in 1/ overview of the CV block Deck (21):
1

what does the CVS help transport around the body?

- O2 and CO2
- nutrients
- metabolites
- hormones
- heat

2

how many time does the heart beat in a lifetime? (70 years)

2,5 billion in 70 years

3

how is the CVS "flexible" in its function?

- pump can vary output
- vessels can redirect blood
- vessels can store blood

4

the two sides of the heart can be considered as two different pumps fitted in parallel/ series?

series

5

what does this fitting imply about the output?

output of both pumps must be equal

6

how are most of the vascular beds fitted?

parallel

7

what does that allow?

- allows for the oxygenation of all tissues (in series, the first ones would get more O2)
- allows regional redirection of blood

8

which vessels act as the "taps" controlling resistance?

arterioles

9

flow =

delta P/ Rh

10

what does this allow?

allows control of resistance (and therefore flow, fractional distribution of blood) to each vascular bed

11

what are the characteristics of elastic arteries?

= aorta, wide lumen, elastic wall, muscle used to dampens pressure variations

12

what are the characteristics of muscular arteries?

muscular arteries, wide lumen, strong non-elastic wall, low resistant conduit

13

what are the characteristics of the arterioles?

narrow lumen, thick contractile wall, they control resistance and therefore flow, allow regional redirection of blood

14

what are the characteristics of the capillaries?

exchange vessels, narrow lumen, thin wall

15

what are the characteristics of venules and veins?

capacitance vessels, wide lumen, distensible wall, low resistance conduit & reservoir, allows fractional distribution of blood between veins & rest of circulation (esp. heart)

16

what valve is between the right atrium and right ventricle?

tricuspid valve

17

what valve is between the left atrium and left ventricle?

mitral valve

18

what valve prevents blood from going back into the right ventricle?

pulmonary semi-lunar valve

19

what valve prevents blood from going back into the left ventricle?

aortic semi-lunar valve

20

what attaches the papillary muscle to the valve cusps?

chordae tendinae

21

what separates the left and right heart?

septum