Function: Gas exchange
between living organisms and the environment.
Deliver air to the lungs:
O2 from lungs to blood
from blood to lungs
Nasal Cavity- main use for breathing in and out. Nasal cavity is cleaned,
moistened and warmed to prevent injury to membranes in the lungs.
*Mouth breathing brings cold and unfiltered air to
lungs and creates a dry lining of the mouth and throat.
throat- incoming air. adenoids & tonsils (lymphatic tissue)
where nasal cavity and mouth meet.
Larynx: voice box- guards entrance for the trachea.
*contains vocal cords. (boys
grow longer to 1 1/4inches for deeper voice)(girls is 3/4) adam’s apple (lump of cartilage) also grows.
apple in frontof trachea, also grows for men.
*glottis- opening to windpipe, slit in larynx.
flap to cover glottis, stops food from entering into the trachea.
Trachea: windpipe- flexible tube with u-shaped rings of cartilage.
tube is the esophagus- leading to the stomach: which is why the
trachea is flexible, it collapses for food to pass by.
two tubes branch from the trachea to the lungs
Lungs: cone shaped soft bags. has blood vessels, lymphatic vessels and nerves.
*pleura- thin membrane
infection caused by infection or bacteria in the lungs.
Bronchioles: smaller branches of bronchi within the lungs.
inflamation of bronchial tubes.
*asthma- bronchial spasms, decr5ease air movement & air trapped in alveoli.
Alveoli: tiny air sacs exchange gases between air and blood.
300 million in lungs.
fill up like balloons when breath in.
capillaries- blood vessels
Flat sheet of muscle that seperates the chest and abdominal
and increases size in chest cavity and air gets vacuumed in;
hi - lo pressure.
hiccup- sudden contraction of diaphragm and vocal cords snap shut.