Respiratory Cycle / Quiet breath: Beginning of inspiration (beginning of the cycle)
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At the beginning of inspiration...

The diaphragm begins to contract (note that it turned red!). There are still no changes in pressure, lung volume, etc.

Achievement Quiz
At the beginning of inspiration, the diaphragm 1 [ A contracts / B relaxes ].
At the beginning of inspiration, the lung volume is 2 [ A at its minimum / B increasing from its minimum to its maximum / C at its maximum / D decreasing from its maximum to its minimum ] (within a quiet breath).
At the beginning of inspiration, the inward elastic force of the lungs is 3 [ A at its minimum / B increasing from its minimum to its maximum / C at its maximum / D decreasing from its maximum to its minimum ] (within a quiet breath).
At the beginning of inspiration, 4 [ A gas (air) flows in / B there is no gas flow / C gas flows out ].
At the beginning of inspiration, the pressure inside the lungs (alveolar pressure) is 5 [ A negative compared / B equal / C positive compared ] to the atmospheric pressure.
At the beginning of inspiration, the negative pleural pressure is 6 [ A at its minimum / B increasing from its minimum to its maximum / C at its maximum / D decreasing from its maximum to its minimum ] (within a quiet breath).
Answer
1 [ A contracts ]
2 [ A at its minimum ]
3 [ A at its minimum ]
4 [ B there is no gas flow ]
5 [ B equal ]
6 [ A at its minimum ]
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