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Flashcards in Respiratory System Deck (113)
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1

At a constant temperature, the amount of a gas that dissolves in a liquid is directly proportional to the partial pressure of the gas above the liquid

Henry's Law

2

How much of a gas will dissolve in a liquid at a given partial pressure also depends on what?

Solubility of the gas

3

How many more times is CO2 more soluble than O2?

20x

4

As compared to atmospheric gas, alveolar gas contains what amounts of O2?CO2?H20?

less, more, and more

5

Gas exchange across respiratory membrane

external respiration

6

What factors influence external respiration?

thickness and SA of respiratory membrane, Partial pressure gradients and gas solubilities

7

What is the average thickness of the respiratory membrane in healthy lungs?

0.5-1 m thick

8

Gas exchange between systemic capillaries and tissue cells

internal respiration

9

What occurs during internal respiration?

O2 moves from blood into tissue and CO2 moves from tissues into blood

10

Which 2 ways is O2 transported in the blood?

1. Bound to Hb
2. Dissolved in plasma

11

Reduced Hb (deoxyHb)

HB that has released O2

12

Define. Hb saturation

extent to which Hb is combined with O2

13

How many O2 are bound to heme to be considered to be fully saturated?

4

14

How manyO2 are bound to heme to be considered partially saturated?

1-3 O2

15

What describes the relationship between the local Po2 and Hb saturation?

oxygen-Hb dissociation curve

16

In blood leaving lungs when the P02 is at 100 mmHg how saturated is Hb?

98% saturated

17

At resting tissues, what are the values for partial pressure of O2 and Hb saturation?

Po2= 40 mmHg
Hb saturation: 75%

18

Which 4 factors affect Hb at a given Po2?

temperature, pH, 2-3,BPG, and Pco2

19

What are the effects of the increase of temperature, H+, Pco2, or BPG?

Hb unloads O2 more easily
Curve shifts to the right
%Hb saturation ill be lower

20

What are the functions of the respiratory system?

to obtain O2 for use by body cells and to eliminate CO2 that cells produce

21

What are the 4 processes in respiration?

1. Pulmonary ventilation
2. External Respiration
3. Transport of gases
4. Internal Respiration

22

What are the major organs of the respiratory system?

nose, nasal cavity, paranasal sinuses, pharynx, larynx, trachea, bronchi, lungs and alveoli

23

Site of gas exchange

respiratory zone

24

All other respiratory passageways that cleanse, and humidify and warm air

conducting zone

25

Which organs are a part of the respiratory zones?

respiratory bronchioles, alveolar ducts and alveoli

26

Provides airway for respiration, filters inspired air, moisten and warms inspired air, houses olfactory receptors

the nose

27

Opens to exterior via nostrils

eternal nose

28

Continuous with pharynx via posterior nasal apertures

nasal cavity

29

Bony structure in the nasal cavity

hard palate

30

Muscular structure in the nasal cavity

soft palate