Alveoli are tiny air sacs in the lungs that carry out gas exchange.

A capillary is a narrow blood vessel that allows the exchange of substances between tissues and blood.

The movement of particles from a high concentration to a low concentration is known as diffusion.

Surface area is the total area of all the exposed surfaces of an object.

Adaptations of the human lungs for gas exchange

Science

Pupils will learn how producers make glucose using photosynthesis, which is used to make biomass and as a fuel for cellular respiration.

Pupils learned how food is broken down to release useful substances such as sugar.

 The diagram shows two structures in the lungs. What is the name of structure A in the diagram?

What type of blood vessel is labelled B? 

There are many alveoli in the lungs in order to increase the {{}} area of the lungs. 

create a short diffusion distance for oxygen and carbon dioxide to be exchanged.

increase the surface area of the lungs for gas exchange. 

maintain the concentration gradient between the alveoli and the capillary. 

Select the option which correctly finishes the sentence: the walls of the alveoli are one cell thick in order to…

provides a large surface area for diffusion.

maintains a concentration gradient of gases.

…air moving in and out of the lungs by inhaling and exhaling.

…using sugar and oxygen to provide energy for life processes. 

…oxygen and carbon dioxide diffusing between the lungs and the blood.

Select the option which correctly finishes the sentence: Gas exchange is the process of…

The diagram shows the human gas exchange system. Which letter on the diagram represents the bronchioles?

The diagram shows the human gas exchange system. Which letter on the diagram represents the alveoli?

A {{}} is a group of cells working together to perform a specific function. 

...from areas of high concentration to low concentration.

...from areas of low concentration to high concentration.

In diffusion, the net movement of particles is...

Once the particles are evenly spread they stop moving.

Which of the following are features of diffusion? 