Lab_Ex37A_HW - Melissa Pomeroy AP III Salti Lab HW Ex 37 A...

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Melissa Pomeroy AP III – Salti Lab HW – Ex. 37 A Exercise 37A Homework - Respiratory System Physiology  What is the definition of inspiration Inspiration is defined as taking an inhalation, or moving air into the lungs. Name the inspiratory muscles - External intercostals - Diaphragm - Accessory inspiratory muscles are: o Sternocleidomastoid muscle o Scalenes muscle o Serratus anterior o Pectoralis minor Summarize the process of inspiration and mention whether it is active or passive process When the diaphragm and the external intercostals contract, the volume of the thoracic cavity increases. The contraction of the diaphragm increases the depth of the thoracic cavity as it flattens from a dome-shape, and the external intercostals elevate the ribs increasing the girth from anterior to posterior and laterally. Due to the adhesion of the parietal layer of the pleura of the lungs to the thoracic wall, and the serous fluid between the parietal and visceral layers, the intrapulmonary volume also increases as these muscles contract. This action lowers the intrapulmonary pressure due to Boyle’s Law. This causes a vacuum effect as the gases then spread out to fill the available space in the lungs, which draws atmospheric air into the lungs. This process is active due to the contraction of the inspiratory muscles. What is the definition of expiration Expiration is defined as air moving out of the lungs. Name the expiratory muscles - Internal intercostals - Transverses thoracis - Accessory expiratory muscles are: o External and internal obliques o Transverses abdominus o Rectus abdominus Summarize the process of expiration mention whether it is active or passive process In the passive process of expiration, which is during eupnea (or quiet breathing), the diaphragm and the external intercostals relax, and the effects of elastic rebound return the thoracic cavity to the starting point pushing the air out of the lungs into the atmosphere. Elastic rebound is the natural tendency of the elastic fibers of the lung tissue to recoil. When the intrapulmonary volume decreases, the gas molecules are squished together increasing the intrapulmonary pressure above atmospheric pressure. The air passively flows out of the lungs following the pressure gradient. What is auscultation Auscultation is listening to the sounds of the heart, lungs or other internal organs, usually with a stethoscope. Describe bronchial sounds, and where you can here the sounds  Bronchial sounds are the sounds produced in the lungs as air is moving through the large
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Melissa Pomeroy AP III – Salti Lab HW – Ex. 37 A respiratory passageways, like the trachea and the bronchi. The sounds through the trachea can be heard with the stethoscope placed on the throat of the subject just below the larynx. Describe vesicular sounds, and where you can here the sounds
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Lab_Ex37A_HW - Melissa Pomeroy AP III Salti Lab HW Ex 37 A...

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