Respiratory Cycle / Quiet breath: summary illustration
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The graph shows temporal changes in each index within one respiratory cycle. The inflow during inspiration is shown as a negative value, and the outflow during expiration is shown as a positive value.

Achievement Quiz
The diaphragm is contracting during 1 [ A inspiration / B expiration ].

The diaphragm is relaxing during 2 [ A inspiration / B expiration ].

The lung volume is at its minimum (within a quiet breath) 3 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The lung volume is increasing from its minimum to its maximum (within a quiet breath) 4 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The lung volume is at its maximum (within a quiet breath) 5 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The lung volume is decreasing from its maximum to its minimum (within a quiet breath) 6 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The inward elastic force of the lungs is at its minimum 7 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The inward elastic force of the lungs is increasing from its minimum to its maximum 8 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The inward elastic force of the lungs is at its maximum 9 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The inward elastic force of the lungs is decreasing from its maximum to its minimum 10 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

Gas (air) flows in 11 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

There is no gas flow 12 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

Gas flows out 13 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The pressure inside the lungs (alveolar pressure) is negative compared to the atmospheric pressure 14 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The pressure inside the lungs (alveolar pressure) is equal to the atmospheric pressure 15 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The pressure inside the lungs (alveolar pressure) is positive compared to the atmospheric pressure 16 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The negative pleural pressure is at its minimum (within a quiet breath) 17 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The negative pleural pressure is increasing from its minimum to its maximum (within a quiet breath) 18 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The negative pleural pressure is at its maximum (within a quiet breath) 19 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

The negative pleural pressure is decreasing from its maximum to its minimum (within a quiet breath) 20 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) / B during inspiration / C at the end of inspiration (beginning of expiration) / D during expiration / E at the end of expiration (beginning of inspiration) ].

Answer
1 [ A inspiration ]
2 [ B expiration ]
3 [ E at the end of expiration (beginning of inspiration) ]
4 [ B during inspiration ]
5 [ C at the end of inspiration (beginning of expiration) ]
6 [ D during expiration ]
7 [ E at the end of expiration (beginning of inspiration) ]
8 [ B during inspiration ]
9 [ C at the end of inspiration (beginning of expiration) ]
10 [ D during expiration ]
11 [ B during inspiration ]
12 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) ]
13 [ D during expiration ]
14 [ B during inspiration ]
15 [ A at the end of inspiration (beginning of expiration) and at the end of expiration (beginning of inspiration) ]
16 [ D during expiration ]
17 [ E at the end of expiration (beginning of inspiration) ]
18 [ B during inspiration ]
19 [ C at the end of inspiration (beginning of expiration) ]
20 [ D during expiration ]
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