GAS EXCHANGE

Question 1

what happens during gas exchange?

Answer 1

breathe in O₂ and

breathe out CO₂

Question 2

where does gas exchange take place?

Answer 2

lungs

Question 3

which organ system does gas exchange use?

Answer 3

respiratory system

Question 4

air enters your mouth/nose. Where does it go next?

Answer 4

down the trachea (windpipe)

Question 5

after air goes down the trachea, where does it go?

Answer 5

down to a bronchus

Question 6

after air reaches your bronchus, where does it go?

Answer 6

air moves through a bronchiole

Question 7

after air moves through the bronchiole, where does it go?

Answer 7

air moves into an alveolus (air sac)

Question 8

once the air is inside an aveolus, what happens?

Answer 8

O2in airdiffusesintotheblood

Question 9

what is diffusion?

Answer 9

when something moves from an area of high concenration to an area of low concentration

Question 10

where are aveoli found?

Answer 10

inside the lungs

Question 11

how are aveoli well adapted for gas exchange?

Answer 11

• large surface area
• thin walls (1 cell thick)

=​ efficient gas exchange

Question 12

when you inhale,

what happens to your ribcage?

Answer 12

muscles between your ribs contract and pull your ribcage up & out (expands)

Question 13

when you inhale,

what happens to your diaphragm?

Answer 13

your diaphragm contracts

and moves down

Question 14

when you inhale, what happens to the volume (space) in your chest?

Answer 14

the volume in your chest increases (more space)

Question 15

when you inhale,

whats happens to the pressure in your chest?

Answer 15

pressure in your chest decreases and pulls air into your lungs

Question 16

when you exhale, what happens to your ribcage?

Answer 16

muscles between your ribs relax and your ribcage pulls down and in

Question 17

when you exhale, what happens to your diaphragm?

Answer 17

your diaphragm relaxes and moves up

Question 18

when you exhale, what happens to the volume in your chest?

Answer 18

decreases to pull air into of your lungs

Question 19

when you exhale, what happens to the pressure in your chest?

Answer 19

increases to push air out of your lungs

Question 20

how do you increase your lung volume (space)?

Answer 20

regular exercise

so you can inhale more O_² = more energy

Question 21

what reduces lung volume (space)?

Answer 21

asthma & smoking

you inhale less O₂ = less energy

Question 22

what process happens in the aveolus?

Answer 22

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