Breathing And Gas Exchange

Question 1

How are alveoli adapted for gas exchange ?

Answer 1

• large surface area
• a rich blood supplies
• short diffusion distance

Question 2

What gas exchanges happen in the alveoli

Answer 2

O2 diffuses into blood stream

CO2 diffuses out of blood stream

Question 3

What are the negative effects of smoking

Answer 3

• cilia are destroyed so dirt is not removed
• the walls of the alveoli are damaged
• lung cancer
• carbon monoxide also binds to haemoglobin

Question 4

What is the job of the ribs

Answer 4

To protect the lungs

Question 5

What is the job of the intercostal muscles

Answer 5

Raise up the lungs to increase volume of thorax

Question 6

What is the job of the diaphragm

Answer 6

A muscular sheet at the bottom of the thorax , controls pressure in the thorax

Question 7

What are the bronchi and bronchioles

Answer 7

Bronchi- first split of the trachea

Bronchioles -smaller branches off bronchi

Question 8

What are alveoli

Answer 8

Tiny air sacs adapted for gaseous exchange

Question 9

How do the lungs use pressure to get air into them

Answer 9

When we need to breathe and the diaphragm moves down creating a low pressure outside the lungs meaning that air moves into the lungs to try and get to the area of low pressure