Equations

Question 1

Co =

Answer 1

Hr x Sv

Question 2

Bp =

Answer 2

Co x tpr

Question 3

Percentage of blood ejected from LV

Answer 3

75

Question 4

Timings of

Atrial systole
Ventricular systole
Both diastole

Answer 4

0. 1
1. .3
2. 4 s

Question 5

San supply

Answer 5

Mainly r coronary artery (60%)

Question 6

Avn supply

Answer 6

Right only 70
Left only 10
Both20%

Question 7

Fev 1 should be
Fvc should be
So fev1/fvc should be

Obstruction =
Restriction =
(Values and why)

Answer 7

4L
5L
0.8

Less than 0.8 (narrowing /damaged airways)
Less than 0.7 (reduces lung volume, stiff)

Question 8

Carina @

Answer 8

Sternal angle (Louis)
T5
2rib

Question 9

Dalton’s law (

Answer 9

P(total) = p(a) +p(b) etc

Sum of partial pressures of all gases in the mix

Question 10

Boules law

• pressure in relation to vol
• pressure and vol and temp and moles
• pressure volume fixed system

Answer 10

p = 1/v

Pv =nrt

P1v1 = p2v2

Question 11

Lap laces law

Pressure in alveoli

Answer 11

Pressure = (2x surface tension)

                         /radius

Question 12

Henry’s law

Solubility of gas

so divers at depth…

Answer 12

Solubility = partial pressure x k (k=Henry’s constant )

at depth, more dissolves in tissues
so need to ascend slowly to make sure this higher amount of dissolved substance can be cleared to prevent decompression illness

Question 13

Alveolar gas equation

Answer 13

PA o2 = Pi o2 - PaCo2/R

(R=constant)

PA alveolar
Pa artieral

Question 14

Pressure of inspired gas =

Pi(gas)=

Answer 14

P(atm) x Fi(gas)

Fi= Fraction of inspired air

Question 15

Wolffs law (bone)

Answer 15

Bone will adapt to the loads it’s placed under

High bone load-> bone remodelling to resist loading in appropriate places

Question 16

Osmolality equation and units

Answer 16

Milliosmoles per litre

= 2 na + 2 k + urea + glucose

Question 17

Starlings law

Answer 17

End diastolic volume increase increases stroke volume (to a point)
Because contractolity increases — full overlap of myosin and actin

Question 18

poiseuilles equation

Answer 18

flow = radius ^4

Question 19

stroke volume

Answer 19

end diastolic volume - end systolic volume

Question 20

ohms law

Answer 20

flow = pressure gradient / (vascular) resistance

pressure gradient = mean arterial pressure - central venous pressure

(pressure in aorta- right atrium)

Question 21

pulse pressure

Answer 21

systolic - diastolic pressure

Question 22

mean arterial pressure

Answer 22

diastolic pressure + 1/3 pulse pressure