Structures Function

 Lungs  Bronchi  Alveoli LOWER RESPIRATORY TRACT  Nasal cavity  Sinuses  Pharynx  Larynx  Epiglottis  Trachea UPPER RESPIRATORY TRACT

 Nasal cavity  Divided by a septum (L & R)  Lined with mucus & cilia

 Sinuses  Body cavity lined with mucus  Drain into nasal cavity  Resonate voice  Pharynx  Connects oral & nasal cavity  Epiglottis  Cartilage that closes when swallowing

 Larynx  Connects pharynx to trachea  Voice box  Vocalization

 Trachea  Known as windpipe  Passage way from the larynx & leads into the 2 bronchi  Sits in front of esophagus  Wall of trachea = C shaped cartilage rings  Lined with mucus & cilia

 Bronchi  Trachea divides into L & R (shorter/wider) bronchial tubes  Thin, muscular walls lined with cilia & mucus  Branch off into smaller tubes (bronchioles)  the alveoli

 Alveoli (Gas exchange occurs)  Small sacs containing surfactant (lipid preventing collapse)  Surfactant weeks in utero  Approx. 300 million per lung (clusters of 15-20)  Contain capillaries (exchange of oxygen/carbon dioxide)  Oxygen diffuses into the capillaries (picked up by RBC)  Carbon dioxide diffuses out of the RBC into the alveoli

 Body has 4-6 min. supply of oxygen  Responsible for taking in oxygen / removing carbon dioxide  Carbon dioxide = metabolic waste byproduct produced by the cells

 Lungs  Airtight, elastic structures enclosed in the thoracic cavity  Covered with pleura (serous membrane causing smooth motion)  Porous / Spongy due to alveoli & high amount of oxygen  Right lung is larger / Left lung is smaller

 Measure while taking pulse; pt. is not to know you are measuring Resp.  Leave pulse site while counting respirations  When finished, document both Pulse and Respirations

 All breathing is silent with effort  Adult  12 to 20  Children  16 to 25  Infant (may use a stethoscope)  30 to 50