My very own mini-moi

The respiratory system Tuesday November 24 th 2009

Agenda The structure and function of the respiratory system. Making your own mini lung model. Homework.

It’s like a maze game but easier!

Lesson objectives Describe the divisions of the respiratory system. I thought when I agreed to donate my body for science it was after I passed away.

Nasal cavity Pharynx Trachea Bronchi Bronchioles Alveoli

Respiratory system: Anatomy 1) Upper -Nose -Pharynx -Larynx -Trachea 2) Lower -Bronchi -Bronchioles -Alveoli 1) Conducting Nasal cavity  Bronchioles 2) Respiratory Alveoli StructuralFunctional

Nose Only external part Provides airway for respiratory system Air enters via the nostrils Moistens, warms air, and filters the air Grows when you lie

Nasal Cavity Divided in midline by nasal septum. Contains Turbinates (thin bones). Turbinates secrete mucous which moistens and filters the air. Capillaries in nasal cavity heats the incoming air.

Pharynx Connects nasal cavity (and mouth) with larynx below. Made of skeletal muscle and lined with mucous. 3 sections: -nasopharynx: passage way only for air. -Oropharynx: passage for air and food. -Laryngopharynx: passage for air and closes during swallowing.

Larynx 5 cm in length Connects to trachea (inferiorly) 3 main functions: 1) prevents food from entering trachea 2) Permits passage of air 3) Produces vocalization (houses the vocal cords)

Vocal Cords When breathing, vocal cords are fart apart. When speaking, vocal cords tense up and approach each other. The air that passes through the narrower space makes the cords vibrate and this produces a sound. A long cord produces a lower (pitch) sound A short cord produces a higher (pitch) sound

Trachea (windpipe) 12 cm long, 2.5 cm diameter. Descends from Larynx to Bronchi. Made of semi-circular (C- shaped) cartilage rings. Esophagus lies posterior.

Bronchi At level of your arm pits the trachea splits into two smaller passage ways called bronchi. Part that enters the lung

How do you make a tissue dance? Put a little boogie in it!

Mucociliary Elevator Passages are lined with ciliated cells and mucous. Mucous traps foreign particles and beating cilia push it to the top where we can: -spit it out. -sneeze it out. Or…ew…swallow it.

Bronchioles The bronchi branch off into secondary –> tertiary bronchi… After 23 divisions the very fine tubes are now called bronchioles.

Bronchioles In here, the air is saturated, warmed to 37C, and filtered. End of conducting division

The lower respiratory tract Bronchioles end in a grape like cluster of tiny sacs called alveoli. Alveoli are surrounded by a network of capillaries. It is in the alveoli that gas exchange occurs.

Gas exchange O2 diffuses across the wall of the alveoli and into the blood to oxygenate it. CO2 diffuses from blood in capillaries (around the alveoli) to the alveoli. The alveoli walls are only 1 cell thick Alveoli are close proximity to the capillaries (short diffusion distance)

The lungs (where) Found in the thoracic cavity surrounded by the ribs.

LET’S PLAY A GAME SPOT THE DIFFERENCE (S) IN THE PICTURES

Lung anatomy Right lung = 3 lobes Left lung = 2 lobes Cardiac impression Apex Base

Pleura 2 layers separated by a fluid filled cavity. Cushion and protect the lung like a force field.

Building your own mini-you lung model U7Eed8