bottom that represents the dlapin answer Check Your Understanding questions 1 an
ID: 195804 • Letter: B
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bottom that represents the dlapin answer Check Your Understanding questions 1 and 2 (p. 619). 1 Apply upward pressure to the membrane. This represents how the diaphragm muscle looks when it is relaxed. What has happened to the pressure of the (has it increased or decreased)? What happened to the volume of the lungs? system RIGU the l 2 Now slowly release the membrane. This represents the diaphragm muscle flattening out as it contracts. What is happening to the pressure as you release 2the membrane? What happened to the volume of the lungs? 23 as a rubber stopper in the top, you can use it to demonstrate the effe THOR-ax) on lung tissue. A pneumothorax generally is caused by a air to enter the pleural cavity. With the What happens to the lungs? Why? membrane flat and the lungs (balloons) inflated, looExplanation / Answer
The process of breathing involves inhalation and exhalation of air through our nostrils. This is achieved by the contraction and relaxation of the diaphragm muscle which causes the inwards and outwards movement of our ribs. This,in turn, helps to increase and decrease the volume of the chest cavity which results in air rushing into our lungs [inhalation] and then pushed out of our lungs [exhalation].
1. When the diaphragm muscle relaxes, it pulls the rib-cage inwards and downwards. This decreases the volume of the chest cavity and pressure is exerted on the lungs. As a result , CO2 rich air is pushed out of the lungs and goes out through the nostrils. This is exhalation.
2. In the second case, as the membrane flattens out and contracts, the intercostal muscles relax and the ribs move outwards and upwards. This increases the volume of the chest cavity and fresh, oxygen rich air enters the lungs through the nostrils. This is inhalation.
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