Respiratory muscles stop contracting there is no

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respiratory muscles stop contracting, there is no longer any pull on the lung tissue and due to elastic properties of the lung tissue, it recoils back to it’s original size. This decreases the volume within the lungs ultimately increasing the intrapulmonary pressure above atmospheric air pressure causing air to be “pushed” out of the lungs. The pulmonary ventilation process obviously depends on inspiration and expiration and various respiratory capacities can be measured to evaluate a person’s respiratory status. There are a number of respiratory volumes, such as tidal volume and expiratory reserve volume that can be measured by a device called a spirometer. Materials 2-liter plastic bottle Rubber bands, balloons, straws and modeling clay Spirometer with mouth pieces Pig specimens Dissection trays Dissection kits Gloves Pre-Lab Evaluation Questions The pre-lab evaluation questions must be answered prior to lab and demonstrated to your lab instructor. You must read through the assigned chapter readings, lab introduction, objectives, overview and procedure to answer these questions. Please cite your work for any reference source you utilize in answering these questions. 1. Why is it recommended that we breathe through our noses? What role do the nasal conchae have within the nose? We should breathe through our nose because the nose hairs act as a filter trapping little debris and the nasal conchae aids to increase the area of the nasal cavity to disrupt the flow of air during inhalation allowing it to be warmed and cleaned (Betts, 2017).
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2. In your own words, describe the role of ciliated pseudostratified columnar epithelium and globet cells lining the trachea. How does the mucociliary elevator fit in with this function? The ciliated pseudostratified columnar epithelium and goblet cells make up the innermost tissue layer of the mucosa within the trachea. The mucociliary elevator is consisted of the pseudo… epithelium and goblet cells, providing a barrier to infections that are inhaled by ensnaring pathogens within the mucus and moved up the elevator (Betts, 2017). 3. Compare and contrast the Type I alveolar cells and Type II alveolar cells. Type I alveolar cells (aka squamous epithelial cells) take up about 97% of the alveoli’s surface, are absorbent to gases and are about 25nm thick. Type II alveolar cells aid in the secretion of pulmonary surfactant which reduces tension in and around the alveolar surfaces (Betts, 2017). 4. In your own words, describe the structure and function of the parietal and visceral pleura. How does the condition pneumothorax relate to the pleura of the lungs? The parietal and visceral pleura make up the friction reducing in the chest cavity around the lungs. The parietal pleura is the outermost layer that binds to the diaphragm, thoracic wall, and mediastinum. The visceral pleura is the outermost layer of the lungs, together these two pleurae allow the lungs to expand and contract within the chest cavity. A pneumothorax occurs when this barrier is
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