exchange of gasses

Question 1

where does the exchange of gases take place

Answer 1

the alveoli

Question 2

NOBAD

Answer 2

number
only one cell thick
blood vessels
air movement
deep and moist

Question 3

Number

Answer 3

there are hundreds of millions of alveoli in the lungs that give them a huge SA to V ratio

Question 4

lungs are suited to the exchange of gases in the following ways

Answer 4

NOBAD

Question 5

Only one cell thick

Answer 5

very thin - 1micro meter - so gases can exchange efficiently

Question 6

blood vessels

Answer 6

bunches of alveoli are surrounded by blood vessels so they are well supplied with blood to exchage gases with

Question 7

air movement

Answer 7

the lung can change its volume by muscle movements

Question 8

deep and moist

Answer 8

the lungs are positioned eep in the body to reduce any evaporaion of the liquid that covers the respiratory surfaces. this is important because gases cannot diffuse through dry substances

Question 9

how is the concentration gradient maintained

Answer 9

• continuous flow of blood
• continous ventilation