CO2 O2 Respiratory System O2 CO2

Respiration exchange and transport of gases carbon dioxide (CO2) leaves cells; oxygen (O2) enters gas exchange occurs across moist membranes covered with blood vessels

Structure and Function

nose (nasal cavity) - warms, filters air as it enters body trachea -air passageway covered with epiglottis larynx (voice box) - upper part of trachea; contains vocal cords, 2 bands of tissue stretched across opening of trachea

bronchi - tubes that carry air from trachea to lungs bronchioles - smaller tubes that branch from bronchi lungs - sac-like organs; site of gas exchange between air and blood

trachea bronchi lungs bronchioles diaphragm - dome-shaped muscle that moves up & down in the breathing process

bronchioles alveoli - grape-like clusters surrounded by network of thin-walled capillaries at the end of bronchioles

Inhalation diaphragm chest wall muscles contract, lifting and pulling ribs outward, diaphragm pulls downward

Exhalation diaphragm reverses the process

chest wall muscles contract, lifting and pulling ribs outward Inhalation Exhalation diaphragm chest wall muscles contract, lifting and pulling ribs outward reverses the process

Gas Exchange

tissue capillary alveoli CO2 Gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries. O2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 O2 CO2 O2 O2 O2 O2 O2 O2 O2 O2 O2 O2 CO2 CO2

Diseases of the Respiratory System

asthma narrowed airways, caused by allergies which clog airways with mucus and produce muscle spasms cystic fibrosis genetic defect which causes excessive production of mucus that clogs airways bronchitis inflammation of bronchi, bronchioles caused by long-term exposure to allergens, cigarette smoke, or other irritants

Review

Name the structure. nasal cavity 1 5 lung larynx 2 6 bronchi trachea 3 bronchioles 4 7 diaphragm

Match the structure with the number. 1. 2. 5. 3. nasal cavity bronchioles diaphragm bronchi trachea larynx lung 6. 4. 7.

sac-like organs; site of gas exchange between air and blood Match the function with the number. 1. sac-like organs; site of gas exchange between air and blood dome-shaped muscle that moves up & down in the breathing process tubes that carry air from trachea to lungs air passageway covered with epiglottis warms, filters air as it enters body smaller tubes that branch from bronchi upper part of trachea; contains vocal cords 5. 2. 3. 6. 4. 7.

1. 5. 2. 6. 3. 4. 7.