respiration Flashcards
LUNGS:
List the adaptations of the alveoli that make it ideal for gas exchange
Single layer of epithelium cells Stretch as breathe in Spring back as breathe out Huge SA Moist Rich blood supply
LUNGS:
What prevents the trachea from collapsing?
Rings of cartilage
LUNGS:
What happens to the intercostals as we breathe in
External contract
Internal relax
LUNGS:
What happens to the rib cage and the diaphragm before we inhale
Ribs - move up and out
Diaphragm - contracts and moves down
LUNGS:
What happens to the volume and pressure of the thorax before we inhale air
Volume increases
Pressure decreases
LUNGS:
What is the ‘tidal volume’?
The volume of air we breath in and out at rest (typically about 0.5dm3)
LUNGS:
List the events of
a) Intercostal Muscles
b) ribs
c) Diaphragm
When we exhale
a) Internal contract, external relax
b) Ribs move down and in
c) Diaphragm relaxes, domes up
Describe how we breathe IN
Diaphragm contracts
External intercostal muscles contract
Volume increases and pressure decreases in thorax
Air moves into lungs
Describe how we breathe OUT
Diaphragm relaxes
Internal intercostal muscles contract
Volume decreases and pressure increases in thorax
Air moves out of the lungs
describe the pathway of an oxygen molecule from alveolus to blood
crosses the single cell alveolar epithelium and then epithelium of the capillary
describe ONE feature of the alveolus that allows efficient gas exchange
ONE CELL thick therefore creating a SHORTER diffusion pathway