gas exchange in lungs

Question 1

what is the tube called that air passes into the lungs through?

Answer 1

trachea

Question 2

what prevents trachea from collapsing during inhalation?

Answer 2

rings of cartilage

Question 3

what are the 2 smaller tubes that the trachea splits into called?

Answer 3

bronchi

Question 4

further into the lungs, bronchi subdivide into many smaller tubes called what?

Answer 4

bronchioles

Question 5

bronchioles end in tiny air sacs called what?

Answer 5

alveoli

Question 6

what happens in alveoli?

Answer 6

gases diffuse in and out of blood streams

Question 7

there is millions of alveoli, what does this mean for the lungs?

Answer 7

the lungs have a huge surface area

Question 8

alveoli have very thin walls, what does this do?

Answer 8

makes diffusion path short

Question 9

do alveoli have good blood supply?

Answer 9

yes

Question 10

by breathing, what is the impact on the rate of diffusion?

Answer 10

increased rate of diffusion

Question 11

breathing brings what and takes away what from alveoli?

Answer 11

brings in oxygen and takes away carbon dioxide