Ventilation and Control of Breathing Part 1 Flashcards Preview

Week 6: Pneumonia and Cough > Ventilation and Control of Breathing Part 1 > Flashcards

Flashcards in Ventilation and Control of Breathing Part 1 Deck (13):
1

Which 3 structures are in the respiratory zone

Respiratory bronchioles
Alveolar ducts
Alveolar sacs

2

Flow and pressure in the lungs

Flow is high (entire CO from RV)
Pressure is low (25/8 mmHg)

3

Ventilation depends on which 3 pressures

Atmospheric
Alveolar
Intrapleural

4

2 main inspiration muscles

Diaphragm (main one)
External intercostals

5

Accessory muscles for
1. Inspiration
2. Expiration

1. Scalenes, sternocleidomastoids
2. Abdominal muscles, internal intercostals

6

Atelectasis

Alveolar collapse

7

3 mechanical factors affecting ventilation

Surface tension of alveolar fluid
Compliance of lungs
Airway resistance

8

Surfactant

Mix of phospholipids and protein
Secreted by type 2 alveolar cells
Lowers surface tension = increases compliance
Secretion stimulated by deep breaths

9

Law of LaPlace

P = 2T/r
Without surfactant, air would flow from small alveoli into large ones and the small ones would collapse

10

Minute ventilation

How much air gets to the alveoli in a minute
V = tidal volume x resp rate

11

Volumes:
1. Tidal
2. IRV
3. ERV
4. RV

1. 500 mL
2. 3000 mL
3. 1000 mL
4. 1200 mL

12

Capacities:
1. Inspiratory capacity
2. Vital capacity
3. FRC
4. Total LC

1. Vt + IRV = 3500 mL
2. Vt + IRV + ERV = 4500 mL
3. ERV + RV = 2200mL
4. Vt + ERV + IRV + RV = 5700 mL

13

What measurement can you not get with spirometry

Residual volume
And therefore not total lung volume either