5 The Nose "The nose is the gatekeeper of the lung.“ The nose consists of Nose & nasal cavityThe only externally visible part of the respiratory systemAir enters the nose through the nostrils.The interior of the nose consists of a nasal cavity divided midline by a nasal septumSlide 13.3a
6 Anatomy of the Nasal Cavity Olfactory receptors are located in the mucosa on the superior surfaceThe rest of the cavity is lined with respiratory mucosaWarms air (BVs)Moistens airTraps incoming foreign particleSlide 13.4a
8 Paranasal Sinuses Function of the sinuses Air conditioning. Reduction of skull weight.Heat insulation .Flotation of skull in water.Increasing the olfactory area.Vocal resonance and diminution of auditory feedback.
9 Pharynx (Throat) Muscular passage from nasal cavity to larynx Entrance from nasal cavity to pharynx is at the internal naresThree regions of the pharynxsuperior region behind nasal cavitymiddle region behind mouthinferior region attached to larynxThe Oropharynx and Laryngopharynx are common passageways for air and foodSlide 13.6
11 Larynx (Voice Box) Located in the anterior throat The larynx surrounds and protectsthe glottis.Inspired air passes through theglottis en route to the lungs.The larynx is made of cartilagesThe int.laryngeal muscles regulatetension in the vocal folds and openand close the glottis.
13 Trachea Connects larynx with bronchi Lined with Beat continuously in the opposite direction of incoming airExpel mucus loaded with dust and other debris away from lungsWalls are reinforced with C-shaped hyaline cartilage
18 Lungs Occupy most of the thoracic cavity Apex is near the clavicle (superior portion)base rests on the diaphragm (inferior portion)Each lung is divided into lobes by fissuresLeft lung – two lobes (U, L)Right lung – three lobes (U, M, L)Slide 13.12a
19 Coverings of the Lungs Pleura covers the lung surface Pleural fluid fills the area between layers of pleura to allow gliding
27 Glossarybronchial tree - the system of airways within the lungs, which bring air from the trachea to the lung's tiny air sacs (alveoli).cardiac notch - the indentation in the left lung that provides room for the heart.diaphragm - a muscular membrane under the lungs.larynx - a muscular structure at the top of the trachea, containing the vocal cords.left inferior lobe - the bottom lobe of the lung on the left side of the body.left superior lobe - the top lobe of the lung on the left side of the body.right inferior lobe - the bottom lobe of the lung on the right side of the body.right middle lobe - the middle lobe of the lung on the right side of the body.right superior lobe - the top lobe of the lung on the right side of the body.trachea (windpipe) - the tube through which air travels from the larynx to the lungs.