Chapter 7 - Chapter 7 The Respiratory System What Does the...

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Chapter 7 The Respiratory System What Does the Respiratory System Do? Brings O 2 rich air into body Expels waste products (CO 2 and H 2 O) Makes speech possible Mucous or Mucus? Mucous membrane is specialized tissue that lines the nose and respiratory system. Mucus is secreted by the mucous membranes. Moistens, warms and filters air entering nose. What Are the Parts of The Nose Nasal septum – cartilage that divides nose into 2 equal sections. Cilia – hairs found inside nostrils. They filter incoming air to remove debris. Olfactory receptors – receptors for the sense of smell. The Tonsils Protect the body from invading organisms. Form a protective circle around the entrance to the respiratory system. Made up of lymphatic tissue. What Are the Sinuses? Air filled cavities within a bone. They are lined with (mucous or mucus?) membrane. Answer: Mucous. The Functions of Sinuses Are: 1. To make bones of the skull lighter. 2. Help produce sound by giving resonance to the voice. 3. To produce mucus that drains into the nasal cavity. What Are the 3 Divisions of the Pharynx (Throat)? 1. Nasopharynx – posterior to the nasal cavity. Goes downward to the mouth. 2. Oropharynx – can be seen when looking into the mouth. Used by respiratory and digestive systems. 3. Laryngopharyx – continues downward to the openings of the esophagus and trachea. What Are Protective Swallowing Mechanisms of the Pharynx?
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During swallowing the soft palate moves up and backward to close off the nasopharynx. At same time the epiglottis closes off
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This note was uploaded on 03/30/2011 for the course BIO 126L taught by Professor Saxena during the Spring '08 term at University of Texas at Austin.

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Chapter 7 - Chapter 7 The Respiratory System What Does the...

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