Adaptations for gas exchange

Question 1

How is ventilation brought about in mammals

Answer 1

Changing pressure inside the lungs and air moves down the pressure gradient

Question 2

What type of process is inspiration

Answer 2

Active

Question 3

What type of process is expiration

Answer 3

Passive

Question 4

How is inspiration brought about

Answer 4

The contraction of muscles

Question 5

How is expiration brought about

Answer 5

Caused by the recoil of elastic tissues

Question 6

Where does has exchange take place in mammals

Answer 6

Alveoli

Question 7

What are the essential properties for efficient gas exchange surfaces

Answer 7

Permeable to gases
Moist as gases most dissolve before they can diffuse across membranes
Large SA
Thin - providing a short diffusion pathway

Question 8

What is the rate of diffusion increased by

Answer 8

Increasing the surface area
Reducing the length of the diffusion Pathway to a shorter pathway
Increasing the steepness of the concentration gradient

Question 9

What properties just the gas exchange surface have for efficient gas exchange

Answer 9

Permeable to gases to allow them to diffuse through the membrane
Moist as gases must dissolve before they can diffuse across membranes
Have a large SA over which gases can diffuse
Be thin to provide a short diffusion pathway