Resp 5

Question 1

PCO2 increase cause bronchioles to…

Answer 1

dilate

Question 2

PCO2 decrease causes bronchioles to…

Answer 2

constrict

Question 3

PO2 decrease causes pulmonary arteries to…

Answer 3

constrict

Question 4

hypoxia

Answer 4

too little oxygen

Question 5

hypercapnia

Answer 5

excess CO2

Question 6

To avoid hypoxia and hypercapnia the body has sensors to monitor the arterial blood and respond to which three variables?

Answer 6

oxygen, CO2, and pH

Question 7

normal arterial pressures

Answer 7

PO2=95mmHg, PCO2=40mmHg

Question 8

normal venous pressures

Answer 8

PO2= 40mmHg

PCO2=46mmHg

Question 9

Alveolar gas exchange is influenced by..

Answer 9

• O2 reaching the alveoli
• gas diffusion between alveoli and blood
• adequate perfusion of alveoli

Question 10

Two causes of low alveolar PO2 (O2 reaching alveoli)

Answer 10

-inspired air has low O2 content
-alveolar ventilation issue (hypoventilation)
(If not) = gas exchange between alveoli and blood

Question 11

What affects diffusion of gas molecules between alveoli and capillaries?

Answer 11

• conc. gradient
• surface area
• barrier permeability

Question 12

factors of barrier permeability

Answer 12

• diffusion distance

- solubility of gas

Question 13

Under normal conditions surface area, diffusion distance and barrier permeability are….

Answer 13

constant

Question 14

In a healthy individual ____________ is variable and the main determinant of diffusion.

Answer 14

concentration gradient

Question 15

emphysema

Answer 15

less surface area for gas exchange

Question 16

fibrotic lung disease

Answer 16

decreased barrier permeability

Question 17

pulmonary edema

Answer 17

increased diffusion distance

Question 18

asthma

Answer 18

decreased conc. gradient

Question 19

The movement of gas molecules from air to liquid is directly proportional to which three factors?

Answer 19

• pressure gradient of the gas
• solubility of gas in liquid
• temperature-relatively constant

Question 20

At equilibrium, PO2 in air and water are ____.

Answer 20

equal

Question 21

Low O2 solubility means concentration are…

Answer 21

not equal

Question 22

QO2=

Answer 22

CO x (arterial[O2] - venous[O2])

Question 23

Hello

Answer 23

You’re doing great