unit 3; structure of human gas exchange system

Question 1

describe the lungs

Answer 1

pair of lobed structures made up of highly branches tubes called bronchioles which end in tiny air sacks called alveoli

Question 2

describe the trachea

Answer 2

flexible airway supported by rings of cartilage that prevent collapse, made of muscle, lined with ciliated epithelium and goblet cells

Question 3

describe the bronchi

Answer 3

two divisions of the trachea, produce mucus to trap dirt particles and move mucus to the throat on cilia, large bronchi still supported by cartilage

Question 4

describe the bronchioles

Answer 4

branching subdivisions of bronchi, walls made up of muscle lined with epithelial cells, muscle allows them to constrict and control the flow of air

Question 5

describe the alveoli

Answer 5

air sacs at the ends of bronchioles, diameter of 100-300 micrometers, collagen and elastic fiber’s between alveoli, alveoli lined with epithelium- they are the gas exchange surface