HUMAN BREATHING SYSTEM Flashcards Preview

3 ADAPTIONS FOR GAS EXCHANGE > HUMAN BREATHING SYSTEM > Flashcards

Flashcards in HUMAN BREATHING SYSTEM Deck (16):
1

Thorax

- airtight compartment where lungs are enclosed

2

Pleural membranes (2)

- line thorax and cover lungs
- fluid between membranes prevents friction between lungs & chest cavity

3

Diaphragm (2)

- dome-shaped muscle at base of thorax
- separates thorax and abdomen

4

Ribs

- surround thorax

5

Intercostal muscles

- between ribs

6

Trachea

- flexible airway to lungs

7

Bronchi

- branches of trachea

8

Bronchioles

- branching network of tubes from lungs

9

Alveoli

- air sacs at the end of the bronchioles

10

Ventilation & mneumonic

- pressure breathing
- Intercostal muscles Ribs Diaphragm Thorax Lungs Pressure
- Inquisitive manic raccoon destroys their lungs

11

Inspiration (6)

- Intercostal muscles contract
- Ribs rise upwards and outwards
- Diaphragm contracts and flattens
- Thorax volume increases
- Lung pressure decreases
- Outside > inside pressure therefore air is forced in.

12

Expiration (6)

- Intercostal muscles relax
- Ribs move downwards and inwards
- Diaphragm relaxes and domes upwards
- Thorax volume decreases
- Lung pressure increases
- Inside > outside pressure therefore air is forced out.

13

Lung tissue (2)

- Elastic
- recoil and regain shape when not expanded

14

Pleural fluid (2)

- surrounds lungs and lines thorax
- acts as a lubricant, prevents friction

15

aveoli surfectant

- anti-sticking mixture
- low surface tension
- allows gases to dissolve before diffusion

16

why are aveoli good respiratory surfaces? (5)

- large SA/V
- gases dissolve in surfectant
- walls made of 1-cell thick squamous epithelium so short diffusion distance
- extensive capillary network