The Human Respiratory Tract

Question 1

nostrils

Answer 1

contain mucous to moisten warm air and trap bacteria

Question 2

pharynx

Answer 2

connects the mouth and nasal cavity to the larynx and esophagus intersection between the trachea and the esophagus “throat”

Question 3

epiglottis

Answer 3

prevents food from entering the trachea

Question 4

bronchioles

Answer 4

network of finer tubes that branch off from the bronchi

Question 5

alveoli

Answer 5

-tiny sacs found at the end of each bronchiole -wall of each sac is only one cell thick -surrounded by capillaries (smallest vessels) -lined with a lipoprotein-based lubricating film to keep them from collapsing -elastic connective tissue fills the spaces between the alveoli and bronchioles

Question 6

capillaries

Answer 6

tiny blood vessels site for gas exchange of O2 and CO2

Question 7

pleura

Answer 7

flexible membrane that contains the lungs made up of two layers separated by a thin film of lubricating fluid