Gas Exchange information
STRUCTURE / thorax, ribs, intercostal muscles, diaphragm, trachea, bronchi, bronchioles, alveoli, & pleural membranes
PROCESSES / gas exchange, intercostal muscles & diaphragm
PURPOSE / gas exchange diffusion, alveoli adaptation, intercostal muscles,
What Happens When You Breathe - name, structure, verb/adj
BREATHING IN
intercostal muscles and diaphragm contract
thorax volume increases
pressure down, air goes in
sternum and ribcage go up and out
intercostal muscles out, diaphragm down
BREATHING OUT
intercostal muscles and diaphragm relax
thorax volume decreases
air forced out
sternum and ribcage drop in and down
intercostal muscles in, diaphragm up
Alveoli Diffusion
Tiny air sacs in the lungs, surrounded by capillaries.
CO2 out of blood, O2 into blood.
They are adapted for efficient exchange —
large surface area
rich blood supply
short diffusion distance