Physiology 4

Question 1

What happens to O2 picked up by the blood at the lungs?

Answer 1

Transported in the blood to the tissues for use

Question 2

What happens to CO2 produced at tissues?

Answer 2

Transported in the blood to the lungs for removal from the body

Question 3

Henry’s Law

Answer 3

The amount of a given gas dissolved in a given type and volume of liquid at a constant temperature is proportional to the partial pressure of the gas in equilibrium with the liquid

Question 4

What does Henry’s law mean?

Answer 4

• If the partial pressure in the gas phase is increased, the concentration of the gas in the liquid phase would increase proportionally
• The partial pressure of gas in solution is its partial pressure in the gas mixture with which it is in equilibrium

Question 5

Resting O2 consumption of our body cells?

Answer 5

about 250ml/min

Question 6

How many ml of O2 per litre of blood at a Po2 of 13.3kPa?

Answer 6

3ml 02

Question 7

Under resting conditions how many ml of O2/ min is taken to tissues as dissolved O2?
Strenous activity?

Answer 7

15ml/min

90ml/min

Question 8

In what 2 forms is O2 present in blood?

Answer 8

Bound to haemoglobin

Physically dissolved

Question 9

What percent of 02 is bound to hameoglobin?

Answer 9

98.5%

Question 10

What % of O2 is physically dissolved?

Answer 10

1.5%

Question 11

Normal O2 concentration in arterial blood?

Answer 11

200ml/litre

Question 12

What does each haemolglobin molecule contain?

Answer 12

4 haem groups which reversibly bind to 1 molecule of O2 each

Question 13

Primary factor in determining the % saturation of haemoglobin with O2?

Answer 13

PO2

Question 14

Oxygen Delivery Index Letters

Answer 14

DO2I

Question 15

Oxygen Delivery Index Equation?

Answer 15

DO2I= CaO2 x Cl 
Do2I= Oxygen Delivery Index (ml/min/metre2)
CaO2= Oxygen content of arterial blood (ml/L)
CI= Cardiac Index (L/min/metre2)