The human respiratory system, the mechanics of breathing in/out and gas exchange via alveoli. All accompanied by diagrams.
|
Erstellt von Abbey Carter
vor etwa 7 Jahre
|
|
Schließen
|
|
Erstellt von Abbey Carter
vor etwa 7 Jahre
|
|
Inspiration:
1) Internal intercostal muscles relax, external contract so ribcage goes up and out
2) Diaphragm contracts and goes down3) Lung volume increases, air pressure inside decreases
4) Air is hence forced into the lungs
Exhalation:
1) External intercostal muscles relax, internal contract, ribcage moves down and inward
2) Diaphragm relaxes and moves back in3) Lung volume decreases, air pressure inside increases
4) Air is hence forced out
Alveoli:
Where gas exchange in the lungs happens. Features include:
-Thin walls (1 cell thick)
-Large surface area
-Moist surface
-Many blood capillaries
