Respiration During Exercise Part 3 W7

Question 1

What is Daltons Law about partial pressure of gases?

Answer 1

The total pressure of a gas mixture is equal to the sum of the pressure that each gas would exert independently

Question 2

What is the partial pressure of inspired O2?

Answer 2

159mmHg

Question 3

What is the partial pressure of CO2?

Answer 3

0.3mmHg

Question 4

How is O2 consumed and CO2 is produced by tissues?

Answer 4

Via cellular respiration

Question 5

What is PO2 decreased to during inspiration?

Answer 5

40mmHg

Question 6

What is venous PCO2 increased during inspiration?

Answer 6

46mmHg

Question 7

What is mean pulmonary artery pressure?

Answer 7

15mmHg

Question 8

What are 2 key characteristics of pulmonary circulation?

Answer 8

Low pressure, low resistance circuit
Thin walled, little smooth muscle

Question 9

What is mean systemic arterial pressure?

Answer 9

100mmHg

Question 10

What does having thin walled, little smooth muscle allow for during pulmonary circulation?

Answer 10

Accepts entire cardiac output

No redistribution of blood flow

Pulmonary vascular resistance decreases during exercise due to recruitment and distension of pulmonary capillaries

Question 11

What is V/Q?

Answer 11

Matching of ventilation to blood flow

Question 12

What does V/Q>1 indicate?

Answer 12

Under perfused (apex of lung)

Question 13

What does V/Q<1 indicate?

Answer 13

Over perfused (base of lung)

Question 14

Why does blood flow increase disproportional more in the upper right lung compared to ventilation from the top to bottom of the lung?

Answer 14

Gravity

Question 15

Why does V/Q improve upon exercise?

Answer 15

Increased tidal volume
Increased pulmonary artery pressures

Question 16

What are the 2 forms oxygen s carried in the blood?

Answer 16

1) Dissolved (2%)
2) Combined with Haemoglobin (98%)

Question 17

What is Henry’s Law?

Answer 17

Amount dissolved is proportional to the partial pressure

Question 18

How much oxygen molecules can a singular haemoglobin molecule transport?

Answer 18

4

Question 19

What is the Bohr Effect?

Answer 19

A rightward shift in the Oxygen Disassociation Curve due to exercise causing increase in H+, CO2 and core body temperature

Question 20

What is the amount of O2 transported as oxyhaemoglobin dependent upon?

Answer 20

Haemoglobin mass

Question 21

What does the Bohr Effect Facilitate?

Answer 21

Unloading of O2 to Active Tissue

Question 22

What is myoglobin?

Answer 22

O2 binding protein found in skeletal muscle

Question 23

What does myoglobin do?

Answer 23

High O2 affinity; unloads at very low PO2 (just a few mmHg)

Shuttles O2 from muscle cell membrane to mitochondria for aerobic respiration

Provides intramuscular O2 storage (reserve)

Question 24

How much more soluble is CO2 compared to O2?

Answer 24

20x

Question 25

What 3 forms is CO2 carried in blood?

Answer 25

1) Dissolved (10%)

2) Bound to Haemoglobin (20%)

3) Bicarbonate (70%