#10, also #8(where is the air coming from) #10 is really important. Name: 7. Doe
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Question
#10, also #8(where is the air coming from) #10 is really important.
Name: 7. Does the pressure in the belljar increase or decrease when the plunger is released and allowed to return to the original position? Can you hear wir leaving the bell jar when you do this? the air coming from? Where in comminay fom We ballons 8 Draw a line matching the particular part of the lungs to the corresponding part of the belil jar representing it bronchi lu thoracic cavit diaphragnm jar plunger tubing balloons 9. During inhalation, is air sucked in, pushed in, or flows in? Explain Grcouse gou lungs evpond dlutring v hien movingad Indoras creasing theSpoen chest anunty 10. During a boxing match, a fighter is struck by a powerful blow to the midsection. He collapses unable to inhale or exhale for a minute, but ultimately recovers. This is what is known as"having the wind knocked out of you. Based on your knowledge of negative pressure inhalation, explain why the boxer was unable to draw breath for a short time.Explanation / Answer
8. The pressure changes in the lungs/thorax during breathing can be mimicked by a bell jar. The trachea and bronchi is the glass tube. The bell jar is chest cavity while balloons represent the lungs. Diaphragm is the rubber sheet. The glass tubing is the only opening through which the air can enter the jar. Rest of the jar is stoppered to prevent air entry.
The bell jar is airtight similar to the chest cavity or thorax. Air enters the glass tube via the tubing. This is similar to trachea in the lungs through which air enter. The rubber sheet/plunger or diaphragm is pulled down, increasing the volume in the jar. This decreases the pressure inside the jar. The pressure at the point of entry is higher creating vacuum is created. This allows air to enter through the glass tube to inflate the balloons, which represent the lungs. The alveoli also inflate and deflate, as they are as elastic like the balloons. Diaphragm cannot be however, pulled down like the rubber tubing, although it flattens.
Reverse occurs when the plunger is released, and air leaves the balloons.
Right choice is:
Bronchi………….Tubing
Lungs…………….Balloons
Thoracic cavity………..Jar
Diaphragm-------Plunger
10. During inhalation, the pressure inside the lungs drops below the pressure at the opening of the lungs. The diaphragm is a large dome shaped muscle present below the lungs. During inhalation, the diaphragm is constricted that draws the lungs down. As a result, the rib cage is expanded, creating a temporary vacuum, which allows air to enter the lungs. As the lungs, get filled with air, the pressure inside the lungs increases. When the pressure inside the lungs increases above the pressure at the mouth opening, lungs will exhale the carbondioxide-laden air. Thus, breathing is due to the pressure gradient created between the lungs and the mouth opening. This is known as negative pressure inhalation.
When the boxer is punched in the midsection, sympathetic nerves center in solar plexus are stimulated, creating a transient contusion. The punch will remove all air from the lungs, creating spasm in the diaphragm. As the diaphragm undergoes spasm, it is paralyzed and hence, cannot constrict to draw air in the lungs during inhalation. The boxer therefore cannot breathe for a minute or two. Nerves surrounding that area will send pain messages to the brain. When the diaphragm recovers, normal breathing will resume.
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