Lung Tissue. List the features of the mammalian lung that adapt it to efficient gaseous exchange
Elastic fibres: aid in the expansion, contraction and stability of trachea walls
Smooth Muscle: smooth muscle contracts to constrict the airway, reducing the flow of air to and from the alveoli e.g. an allergic reaction like asthma
Ciliated Epithelium: contain numerous tiny, hair like structures projecting from the membrane called cilia. They waft mucus up the airway to the back of the throat- the mucus is then swallowed into the stomach where the acid kills any bacteria trapped within
Cartilage: Plays a structural role. It supports the trachea and bronchi, holding them open. This prevents collapse when the air pressure is low during inhalation. It does not form a complete ring so there is some flexibility for moving your neck etc.
Goblet Cells: Secrete mucus to trap tiny particles e.g. pollen or bacteria. This reduces the risk of infection.
You should email your completed task- you have 1 double lesson to complete this plus time at home.