subject makes me go bye-o

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