gas exchange in the lungs

Question 1

what is a trachea

Answer 1

A tube where air passes into the lungs

Question 2

Name one key feature of the trachea

Answer 2

contains rings of cartilage to prevent the trachea from collapsing during inhalation

Question 3

What is after the rings of cartilage on the trachea

Answer 3

The trachea now splits into two smaller tubes called Bronchi with the one passing to each lung

Question 4

further into the lungs the bronchis subdivides into smaller tubes called what

Answer 4

bronchioles

Question 5

what do the bronchioles end in

Answer 5

tiny air sacs called alveoli

Question 6

what happens in alveoli

Answer 6

alveoli are where gases diffuse in and out of the bloodstream

Question 7

how are alveoli adapted to gas exchange (bloodstream)

Answer 7

oxygen in the air diffuses across the respiratory membrane from the alveoli and into the bloodstream
and carbon dioxide diffuses across the respiratory membrane from the blood and back into the air

Question 8

ALVEOLI ADAPTATIONS

How is millions of alveoli beneficial?

Answer 8

means that the lungs have a huge surface area

Question 9

ALVEOLI ADAPTATIONS

what type of walls do they have to make gas exchange rapid and short

Answer 9

the alveoli have very thin walls so the diffusion path is very short

Question 10

ADAPTATIONS OF ALVEOLI

explain their blood supply

Answer 10

well I have a very good blood supply. Once the oxygen diffuses into the blood, it is rapidly removed. This insures that the concentration gradient is a steep as possible

Question 11

breathing increase the rate of diffusion

Answer 11

brings fresh oxygen into the alveoli and takes away the carbon dioxide
this makes the concentration gradient high for these gases. That increases the rate of diffusion