The lungs

Question 1

Function of the cartilage

Answer 1

Supports the trachea and bronchi, holding them open.

Question 2

Function of the Smooth Muscle

Answer 2

Contracts, which will constrict the airways and make the lumen narrower.

Question 3

Function of the Elastic fibres

Answer 3

When smooth muscles contract, these deform. When the smooth muscle relaxes, these recoil to help dilate the airways.

Question 4

Function of the Goblet cells and glandular tissues

Answer 4

Secretes mucus, which traps tiny particles in the air.

Question 5

Function of the Ciliated epithelium cells

Answer 5

Have numerous tiny, hair like projections that waft mucus up the airway to the back of the throat.

Question 6

What three main factors affect the need for a transport system?

Answer 6

• Size
• SA:V ratio
• Level of activity