Adaptations for gas exchange Flashcards Preview

Biology Unit 2 AS > Adaptations for gas exchange > Flashcards

Flashcards in Adaptations for gas exchange Deck (9)
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1
Q

How is ventilation brought about in mammals

A

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

2
Q

What type of process is inspiration

A

Active

3
Q

What type of process is expiration

A

Passive

4
Q

How is inspiration brought about

A

The contraction of muscles

5
Q

How is expiration brought about

A

Caused by the recoil of elastic tissues

6
Q

Where does has exchange take place in mammals

A

Alveoli

7
Q

What are the essential properties for efficient gas exchange surfaces

A

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

8
Q

What is the rate of diffusion increased by

A

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

9
Q

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

A

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