Respiration Gas transport

Question 1

What is the pulmonary system?

Answer 1

Oxygen enters the blood and CO2 leaves

Question 2

What is partial pressure?

Answer 2

Concentration of a gas within a mixture of gases

Question 3

What two forms can oxygen be carried in?

Answer 3

Dissolved
Bound to haemoglobin (Hb)

Question 4

How is dissolved O2 measured in an arterial blood sample?

Answer 4

Partial pressure of O2

Question 5

How many ml of O2 is there per mmHg?

Answer 5

0.003ml O2/100ml blood

Question 6

What is the CO per minute for an average individual?

Answer 6

5L/min

Question 7

How many ml of O2 per min is required for tissues at rest?

Answer 7

250 ml O2/min

Question 8

How many heme groups in a haemoglobin molecule?

Answer 8

4 joined to a globin protein
2 alpha and 2 beta

Question 9

Where is the site of O2 bonding in a haemoglobin molecule?

Answer 9

Iron, reduced ferrous form

Question 10

How long does it take for red blood cells to enter and leave an alveoli?

Answer 10

1 second

Question 11

The oxyhaemoglobin dissociation curve illustrates the relationship between what?

Answer 11

Curve illustrates relationship between PO2
in blood and number of O2 molecules bound to Hb

Question 12

What happens when PO2 drops below 60mmHg?

Answer 12

A large amount of O2 is released from Hb, decreasing saturation

Question 13

How many o2 molecules can Hb molecule bind with?

Answer 13

4

Question 14

What is used to measure o2 saturation?

Answer 14

Pulse oximeters

Question 15

How many ml of CO2 is produced per min in normal healthy conditions?

Answer 15

200ml

Question 16

What 3 ways can CO2 be transported?

Answer 16

7% dissolved
23% bound to haemoglobin
70% converted to bicarbonate by carbonic anhydrase

Question 17

What does bicarbonate from CO2 dissociate into?

Answer 17

H+ and HCO3-

Question 18

What is the name for the S shaped curve>

Answer 18

Sigmoid