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air enters the respiratory tract through the nose. the air is filtered moistened and warmed as it enters the two nasal openinga and travels to the nasal cavity. the nasal septum seperated the nares this entire area is lined with mucouse membrane which is vasucalr

provies warmth and moisture secretes 1 L of moisture everyday

lateral to the nasal cavities are three scroll like bones which cause the air to move over a larger surface area.

communicate with the nasal structure they are hollow areas that make the skull lighter and ae belived to give resonancde to the voice. they are lined with mucous membrane that are continouse with the nasal cavity

receptors for the sence of smell. they are the nerve endings of the olfactory nerve. the first cranial nerve the nasolacrimal ducts communicate with the upper nasal chamber

the passageway for both air and food

enter either side of the nasopharyxn connecting it to the middle ear

located in the nasopharynx whereas the palatine tonisls are in the oropharynx

is supported by none areas of cartilage and connects the pahrynx with the trachea.the larynx contains the vocal cords during expiration air rushes over the vocal cords causing them to vibrate

divides the right and left bronchi. the rntire structire is lined with mmucous membrane and tiny cilia which produce motion or current in a fluid that sweep dust or debris upward toward the nasal cavity

the large bronchi continue to divide into smaller structure called bronchioles. these structures divides into smaller tubelike structures called terminal bronchioles all these structures are lined with ciliated mucous membranes as is the trachea

alveoli

gas exchange take place. diffusion of carbon dioxide and oxygen occurs

the lungs are large paired spongy cone shaped organs.the right lung weighs approximmately 625 g and the left lung weights 570 g

contains three lobes

contains 2 lobes located approximately 1 inch above the first rib is the narrow part of each lung

the surface of each lung is covered with THIN moist serous membrane

the walls of the thoracis cavity are covered with the same type of membrane

produce a serous secretion which allows the lung to slide over the walls of the thorax while breathing

the body produces exact amount of serous secreetions needed if to much is produced fluid accumulates in the pleural space the pleural space becomes distended and puts pressure on the lung making it difficult to breath