Unit 2 Lecture 14 (continued)

Question 1

How does CO2 travel through the body?

Answer 1

released from tissue cells –> into plasma –> into red blood cells

Question 2

What 2 things are formed in red blood cells?

Answer 2

H2CO3 (carbonic acid) and “carbaminohemoglobin”

Question 3

What are the 3 modes of transport of CO2 throughout the body?

Answer 3

1. travel in plasma as bicarbonate ions
2. travel in carbaminohemoglobin
3. dissolved in plasma

Question 4

What is the most common way CO2 is transported?

Answer 4

transported in plasma as bicarbonate ions

Question 5

What is carbonic anhydrase?

Answer 5

an enzyme that increases the rxn of CO2 out of the body

Question 6

Does O2 go in or out of alveoli?

Answer 6

Go out of alveoli

Question 7

Does CO2 go in or out of alveoli?

Answer 7

Go in alveoli

Question 8

During internal respiration, what “shifts” across RBCs?

Answer 8

Chloride

Question 9

How does CO2 and O2 diffuse through red blood cells during internal respiration?

Answer 9

CO2 goes in and O2 goes out of red blood cells

Question 10

Which way does Cl- travel through red blood cells during internal respiration?

Answer 10

Cl- goes in

Question 11

What must happen in order for Cl- to enter RBC during internal respiration?

Answer 11

Bicarbonate (HCO3-) must be spit out so Cl- can replace the loss in (-) charge

Question 12

What is the partial pressure of O2 in oxygenated and deoxygenated blood?

Answer 12

oxygenated blood - 100 mmHg

deoxygenated blood- 40 mmHg

Question 13

What is the partial pressure of O2 in systemic tissues cells?

Answer 13

40 mmHg

Question 14

What is the partial pressure of CO2 in oxygenated and deoxygenated blood?

Answer 14

oxygenated blood - 40 mmHg

deoxygenated blood - 45 mmHg

Question 15

What is the partial pressure of CO2 in systemic tissue cells?

Answer 15

45 mmHg

Question 16

During external respiration, what “shifts’ across red blood cells?

Answer 16

Cl-

Question 17

During external respiration, does Cl- go in or out of the rbc?

Answer 17

Cl- leaves the RBC

Question 18

During external respiration, how does O2 and CO2 diffuse through RBCs?

Answer 18

O2 enters RBC

CO2 leaves RBC

Question 19

What must happen in order for Cl- to leave the RBC during external respiration?

Answer 19

Bicarbonate (HCO3-) must enter the RBC

Question 20

What is the partial pressure of O2 and CO2 in alveolar air?

Answer 20

PO2 - 105 mmHg

PCO2 - 40 mmHg

Question 21

What describes oxygen loading at the pulmonary capillaries?

Answer 21

a time dependent process

Question 22

Define transit time

Answer 22

the rate of GAS diffusion and the rate of BLOOD FLOW through the pulmonary capillaries

Question 23

How long is comlete diffusion of O2?

Answer 23

.25 seconds

Question 24

What is transit time at rest?

Answer 24

0.8 seconds

Question 25

Is there a greater saturation of O2 in the arterial end or venous end of pulmonary capillaries?

Answer 25

venous end of pulmonary capillaries