Respiratory+System-+Period+1

Brittany Agnew Lizbeth Hernandez
 * Place your team Names at the top. Final Copy **

**Ventilation** - the exchange of respiratory gases (O2 and CO2) between the atmosphere and the lungs. This involves gas pressures and muscle contractions in the Respirstory System.

In logical order complete all of the research points required for your body system.
 * [[image:ressys.gif width="139" height="233"]]

-made of pair of lungs and a series of passage ways each one extending deeper into your body. -includes the nasal passage, throat, windpipe, and the bronchi. -All of the mechanisms involved in getting oxygen to cells of the body and getting rid of carbon dioxide. -To breath:air flows into the pharynx(throat),passes the epiglottis, and moves through the larynx then travels down the trachea(windpipe). -when inhale, muscles between your ribs contract and your rib cage rises. diaphragm muscle contracts becomes flattened and moves lower in the chest cavity. Air rushes into lunges because air pressure is greater than the air pressure inside your lungs. -when exhale, muscles associated with the ribs relaz, your ribs drop down in chest cavity. Diaphragm relaxes returning to resting position. Relaxation of muscles decreases volume of chest cavity and forces most air out of alveoli. media type="youtube" key="gYSIWceGMxY" height="344" width="425" -to prevent most of this material from reaching the lungs, the nasal cavity, trachea, and bronchi are lined with ciliated cell that secrete mucus. Cilia constantly beat upward toward throat, where foreign material can be swallowed or expelled by coughing or sneezing. -clusters of alveoli are surrounded by networks of tiny blood cells. external respiration involves the exchange of oxygen or carbon dioxide between the air in the alveoli and the blood that circulates through the walls of the alveoli. -diaphragm's job is to help pump carbon dioxide out of lungs and pull oxygen into lungs. -At rest, epiglottis is upright and allows air to pass through the larynx and into rest of respiratory system.

__trachea__:tubelike passage way for air flow that connects with two bronchi tubes that lead into the lungs __alveoli__: sacs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the air __larynx:__where speech sounds are produced __diaphragm__: sheet of muscles that lies across the bottom of the chect cavity __Empiglottis__: the flap of cartilage lying behind the tongue and in front of the entrance to the the larynx __lungs__: located in the chest and so large that they take up most of the space in there.** __**Fun Facts**__
 * The right lung is slightly larger than the left.
 * Hairs in the nose help to clean the air we breathe as well as warming it.
 * The highest recorded "sneeze speed" is 165 km per hour.
 * The surface area of the lungs is roughly the same size as a tennis court.
 * The capillaries in the lungs would extend 1,600 kilometres if placed end to end.
 * We lose half a litre of water a day through breathing. This is the water vapour we see when we breathe onto glass.
 * A person at rest usually breathes between 12 and 15 times a minute.
 * The breathing rate is faster in children and women than in men.