Pathway of air and Gaseous exchange

Complete the following pathway of air into the body: (Suggest two)

1. Mouth

2. Trachea

3.

4.

5. Alveoli

• Alveolus

• Bronchi

• Bronchioles

• Pleura

State the order of the pathway of air into the body.

• Mouth/nose. Bronchi. Bronchioles. Alveoli. Trachea

• Mouth/nose. Trachea. Bronchioles. Bronchi. Alveoli

• Mouth/nose. Trachea. Bronchi. Bronchioles. Alveoli

• Mouth/nose. Trachea. Alveoli. Bronchi. Bronchioles.

Where does the Gaseous exchange take place?

• Bronchi

• Bronchioles

• Diafragma

• Alveoli

Suggest four characteristics of the Alveoli.

• One cell thick, allowing for diffusion to occur easily

• Surrounded by capillaries, which allows good blood supply

• Contains elastic fibres, allowing for an increase in surface area during inspiration

• Are small in size allowing for a large surface area for diffusion to take place

• Is located in the diaphragm

Complete the following pathway of air into the body:

1. Mouth

2. Trachea

3.

4.

5. Alveoli

One of the characteristics of the Alveoli is that they are surrounded by capillaries. Suggest an explanation for this.

• this allows a good blood supply which ensures that oxygen can be transferred into the blood and carbon dioxide removed.

• due to the thinness of the walls, diffusion of oxygen and carbon dioxide through alveoli is easy.

• this allows the alveoli to increase in surface area during inhalation.

• this provides stability to the alveoli and protection

One of the characteristics of the Alveoli is that the walls of the alveoli contain elastic fibres. Suggest an explanation for this.

• this allows a good blood supply which ensures that oxygen can be transferred into the blood and carbon dioxide removed.

• due to the thinness of the walls, diffusion of oxygen and carbon dioxide through alveoli is easy.

• this allows the alveoli to increase in surface area during inhalation.

One of the characteristics of the Alveoli is that they are One Cell thick. Suggest an explanation for this.

• this allows a good blood supply which ensures that oxygen can be transferred into the blood and carbon dioxide removed.

• due to the thinness of the walls, diffusion of oxygen and carbon dioxide through alveoli is easy.

• this allows the alveoli to increase in surface area during inhalation.

One of the characteristics of the Alveoli is that the walls of the alveoli are moist. Suggest an explanation for this.

• allows diffusion through the cell walls;

• the size and high number of alveoli allow for a large surface area for diffusion to take place;

• the mucus inside the alveoli helps to moisturise and filter the dust inside the lungs

• allows the walls of the lungs to expand

One of the characteristics of the Alveoli is that the alveoli are small in size. Suggest an explanation for this.

• allows diffusion through the cell walls;

• the size and high number of alveoli allow for a large surface area for diffusion to take place;