B3.1.2

What is permeability in the context of gas exchange surfaces?

A membrane that allows liquids and gases to pass through.

Why is a thin tissue layer important for gas exchange?

A thin tissue layer reduces the diffusion distance for gases, allowing oxygen to enter cells or the bloodstream and carbon dioxide to leave more quickly.

What happens if the tissue layer is too thick?

If the tissue layer is thick, it makes it difficult for gases like oxygen and carbon dioxide to diffuse across the membrane.

What role does moisture play in gas exchange?

Moisture is key because gases must dissolve in a liquid to diffuse across membranes, facilitating the diffusion of oxygen into cells and carbon dioxide out.

What is the significance of surfactant production in gas exchange?

Surfactant production helps maintain the moisture gradient, which is essential for the dissolution of gases during gas exchange.

What are the four properties of gas exchange surfaces?

permeable, large, moist, thin

How does permeability allow for efficient gas exchange

allow oxygen and CO2 to diffuse freely

How does size allow for efficient gas exchange

total surface areas is larger in relation to volume of the organism

How does moisture allow for efficient gas exchange

Allows gases to dissolve 

How do thin walls allow for efficient gas exchange

Allows gases to diffuse through a short distance