inhalation and exhalation

Question 1

inhalation

Answer 1

diaphragm moves down and intercostal muscles contract

plungs<patmosphere, air moves into lungs

Question 2

exhalation

Answer 2

diaphragm moves up and intercostal muscles relax

plungs>patmosphere, air forced out of lungs

Question 3

gas exchange

Answer 3

air that enters alveooli has a high concentration of o2, o2 will diffuse from high conc. alveoli to low conc. capillaries

blood from capillaries has a high conc. of co2, co2 will diffuse from high conc. capillaries to low conc. alveoli

Question 4

pathway of o2

Answer 4

environment to nasal cavity to pharynx to epiglottis to larynx to trachea to bronchi to bronchioles to alveoli to capilaries to blood to body

Question 5

pathway of co2

Answer 5

body to blood to capillaries to alveoli to bronchiles to bronchi to trachea to larynx to epiglottis to pharynx to nasal cavity to environment