Structure of the Human Gas-exchange System

Question 1

How is the human gas-exchange system arranged?

Answer 1

-Nostril leading to a trachea leading to bronchi leading to bronchioles leading to network of alveoli

Question 2

What is the structure and function of the major components of the gas exchange system?

Answer 2

=Lungs
-Lobed structures made up of branched tubules which lead to tiny air sacs called alveoli

=Trachea
-Flexible airway supported by cartilage
-Tracheal walls made up of muscle, lined with cilia and golbet cells

=Bronchi
-Divisions of the trachea
-Similar in structure and function to trachea

=Bronchioles
-Branching subdivisions of bronchi
-Constrict tto control flow of air in and out of the alveoli

=Alveoli
-Air-sacs that have collagen and elastic fibres between them
-Lined with epithelium
Stretch when breathing in and spring back into place when breathing out
-Large SA:V