Unit 1 Lecture 13

Question 1

What is Dalton’s Law?

Answer 1

Gases make a pressure PROPORTIONAL to its concentration

Question 2

What is total gas pressure?

Answer 2

the pressure of all of the gases added up

Question 3

What is partial pressure?

Answer 3

The pressure of one component as a part of a total

Question 4

How do you calculate partial pressure?

Answer 4

total pressure X the composition of the desired component (in decimals)

Question 5

What is the atmospheric pressure?

Answer 5

760 mmHg or 1 atm

Question 6

What is the P(O2) and P(CO2) in deoxygenated (pulmonary arterial) blood?

Answer 6

P(O2) = 40 mmHg

P(CO2) = 45 mmHg

Question 7

What is the P(O2) and P(CO2) in oxygenated (arterial) blood?

Answer 7

P(O2) = 100 mmHg

P(CO2) = 40 mmHg

Question 8

During inspiration, how much fresh air enters the lungs?

Answer 8

500 mL

Question 9

What does the fresh air mix with in the lungs during inspiration?

Answer 9

Functional residual capacity

Question 10

What happens to the partial pressure of O2 and CO2 in the alveoli during inspiration of fresh air?

Answer 10

PO2 - increases slightly

PCO2 - decreases slightly

Question 11

What happens to the average alveolar values (pressure) during inspiration of fresh air?

Answer 11

values do not change much bc the volume of fresh air is too small compared to the FRC

Question 12

What is the difference between expired air and inspired air?

Answer 12

Expired air has a LOWER O2 concentration and higher CO2 concentration than inspired air

Question 13

What happens to O2 during inspiration?

Answer 13

It is removed from the lungs by the blood

Question 14

What happens to CO2 during inspiration?

Answer 14

It moves from the blood to the lungs

Question 15

In the pulmonary capillaries, do alveolar veins or alveolar arteries have more O2?

Answer 15

alveolar veins because deoxygenated blood enters the lungs through the arteries and oxygenated blood leaves the lungs through the veins

Question 16

At tissues, does O2 go into or out of the cell?

Answer 16

Into….. during systemic circulation, oxygen oxygenates the tissue cells

Question 17

At tissues, does CO2 go into or out of the tissue cells?

Answer 17

Out of…. CO2 leaves tissues to go back to heart to be re-oxygenated

Question 18

At tissues, do systemic arteries or systemic veins have more O2?

Answer 18

systemic arteries….. arteries supply O2 during systemic circulation

Question 19

What is the respiratory quotient?

Answer 19

Amount of CO2 produced / O2 consumed

Question 20

What is the RQ for pure fat?

Answer 20

0.7

Question 21

What is the RQ for pure carbohydrate?

Answer 21

1.0