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Flashcards in Respiratory physiology Deck (34):
1

How many generations of airways in the respiratory system?

23

2

What cells produce surfactant?

Type 2 pneumocytes

3

Macrophages in the lungs

Alveolar macrophages

4

most common cause of hemoptysis

Nasopharyngeal CA

5

Maintains oxygenation in between breaths

Residual volume

6

Resting volume of the lung

Functional residual capacity

7

Elasticity is __________ in emphysema

Decreased

8

Carbon dioxide and oxygen during strenuous exercise and disease states is characterized by _______gas exchange

Diffusion limited

9

Gases with perfusion limited gas exchange

N2O O2 and CO2 under normal conditions

10

Hemoglobin with ferric iron

Methemoglobin

11

Alpha2 gamma2 hemoglobin

Fetal hgb
HbF

12

Shape of oxygen hgb dissociation curve

Sigmoidal

13

Binding of first oxygen molecule increases affinity for second molecule

Positive cooperativity

14

Chloride bicarbonate exchange in RBCs

Chloride shift

15

Majority of carbon dioxide in blood

Bicarbonate (90%)

16

Site of highest ventilation

Base of lungs

17

Inspiratory center which controls basic rhythm for normal inspiration

Dorsal respiratory group

18

Overdrive mechanism

Ventral respiratory group

19

Initiates hering-breuer reflex

Lung stretch receptors

20

Responsible for feeling of dyspnea in left sided heart failure

J cells

21

Peripheral chemoreceptors respond to _________

Low PaO2

22

Found in the lower pons and decreases respiratory rate

Apneustic center

23

Pneumotaxic center function

Increases respiratory rate
Found in upper pons

24

Causes of pulmonary global hypoxic vasoconstriction

High altitude
Fetal circulation

25

Active component of surfactant

Dipalmitoylphosphatidylcholine DPPC

26

Muscles for forced inspiration

External intercostals, SCM, Anterior serratus

27

Muscle involved in normal expiration

None

28

Anatomic dead space

150 ml

29

Alveolar dead space in healthy humans

0 ml

30

Vital capacity is the sum of ______ + ________ + _________

IRV + ERV + TV

31

Tidal volume is approximately _____ ml

500

32

Pulmonary hypertension > _____mmHg

25

33

FEV1/FVC ratio of a healthy person

0.8

34

Conducting zone of the airways

Nose to terminal bronchioles