GAS EXCHANGE Flashcards
what happens during gas exchange?
breathe in O2 and
breathe out CO2
where does gas exchange take place?
lungs
which organ system does gas exchange use?
respiratory system
air enters your mouth/nose. Where does it go next?
down the trachea (windpipe)
after air goes down the trachea, where does it go?
down to a bronchus
after air reaches your bronchus, where does it go?
air moves through a bronchiole
after air moves through the bronchiole, where does it go?
air moves into an alveolus (air sac)
once the air is inside an aveolus, what happens?
O2in airdiffusesintotheblood
what is diffusion?
when something moves from an area of high concenration to an area of low concentration
where are aveoli found?
inside the lungs
how are aveoli well adapted for gas exchange?
- large surface area
- thin walls (1 cell thick)
= efficient gas exchange
when you inhale,
what happens to your ribcage?
muscles between your ribs contract and pull your ribcage up & out (expands)
when you inhale,
what happens to your diaphragm?
your diaphragm contracts
and moves down
when you inhale, what happens to the volume (space) in your chest?
the volume in your chest increases (more space)
when you inhale,
whats happens to the pressure in your chest?
pressure in your chest decreases and pulls air into your lungs
when you exhale, what happens to your ribcage?
muscles between your ribs relax and your ribcage pulls down and in
when you exhale, what happens to your diaphragm?
your diaphragm relaxes and moves up
when you exhale, what happens to the volume in your chest?
decreases to pull air into of your lungs
when you exhale, what happens to the pressure in your chest?
increases to push air out of your lungs
what process happens in the aveolus?
diffusion
- O2 diffuses from the aveolus into red blood cells to give your body energy
- CO2 diffuses from the red blood cells into the aveolus so you can exhale it as a waste product
