Lower Respiratory Tract

Question 1

lower respiratory tract contains..

Answer 1

conducting and respiratory portions

Question 2

larynx, trachea, bronchi, bronchioles, terminal bronchioles

Answer 2

no gas exchange

Question 3

respiratory bronchioles, alveolar ducts, alveoli

Answer 3

site of respiration

Question 4

bronchial tree

Answer 4

trachea splits into right and left main bronchi

Question 5

bronchioles…

Answer 5

have no cartilage

Question 6

bronchiole walls..

Answer 6

no cartilage, but have a thick layer of smooth muscle

Question 7

bronchioconstriction

Answer 7

difficult to get air

Question 8

bronchodilation

Answer 8

opens air passage

Question 9

respiratory portion includes..

Answer 9

• terminal bronchioles
• respiratory bronchioles
• alveolar ducts
• alveolar sac
• small, saccular outpocketings = alveoli

Question 10

alveoli

Answer 10

site of gas diffusion between pulmonary capillary blood

Question 11

alveolar wall

Answer 11

made up of alveolar type I cells and alveolar type II cells

Question 12

alveolar type I cells

Answer 12

simple squamous epithelia -> rapid gas diffusion

Question 13

alveolar type II cells

Answer 13

almost cuboidal shape, product pulmonary surfactant(prevents collapse) = decreased surface tension

Question 14

last to develop?

Answer 14

alveoli

Question 15

respiratory membrane

Answer 15

thin wall between alveolar lumen and the blood across which gases diffuse
- contains plasma membrane of the type I alveolar cell and plasma membrane of the capillary cell