Respiratory System

Question 1

breathing

Answer 1

mechanical movement of air into and out of the lungs.

Question 2

external respiration

Answer 2

gas exchange between the atmosphere and the blood, occurring in the lungs.

Question 3

internal respiration

Answer 3

gas exchange between the body’s cells and the blood.

Question 4

trachea

Answer 4

tube that carries air from the larynx to the bronchi.

Question 5

bronchus

Answer 5

one of the two large tubes that carries air to the lungs.

Question 6

lung

Answer 6

largest respiratory system organ in which gas exchange takes place

Question 7

alveolus

Answer 7

in the lung, a thin-walled air sac surrounded by capillaries.

Question 8

respiratory system structures

Answer 8

nasal passages, pharynx, larynx, epiglottis, trachea, lungs, bronchi, bronchioles, alveoli, diaphragm

Question 9

respiratory system functions

Answer 9

exchange O2 and CO2 between
- atmosphere & blood (External respiration)
– blood & body’s cells (Internal respiration)

Question 10

how does gas exchange occur

Answer 10

Diffusion: O2 & CO2 move into
and out of cells from
high to low
concentrations.

Question 11

inhalation

Answer 11

O2 into lungs, diaphragm contracts and pushes down –
pulling air in

Question 12

exhalation

Answer 12

CO2 out of lungs. Diaphragm relaxes, lungs deflate –
pushing air out

Question 13

what protects against foreign materials entering the lungs

Answer 13

cilia, mucous, & nose hairs