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In the expiration, external intercostal muscles will relax and permitting ribcage to move downwards. Internal intercostal muscles will contracts and decreasing the volume of thorax.

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External intercostal muscles located between the ribs, it contracts during the inspiration breathing which help to pulling the ribs upwards and outwards. Internal intercostal muscles relax in this process.

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Expiration ( also called exhalationis) the flow of the respiratory current out of the organism.

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1. Expiration begins with the inspiration ends.

2. The chest cavity will contract during the expiration, due to relaxation of the diaphragm.

3. Then the air pressure in the lungs increase  leads to a decrease in volume inside the lung.

4. Air is pushed out into the airways as the lung returns to its smaller size.

5. Then the air is forced to moves through nose and mouth.

Source of picture:
Wikispaces (p. d.) SBI3C respiratory system, https://bio3c.wikispaces.com/cecilia

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1. For human body, inspiration is the flow of air into an organism from the external environment.

2. The air will goes through trachea, and into the alveoli.

3. Inspiration begins with the contraction of the diaphragm, this movement cause the expansion of chest cavity. It usually has a lower pressure compared to atmoshperic air. But the diaphragm contracts and enables the chest cavity to occupy a larger volume.

4. Besides, pressure and volume are inversely related to each other. Therefore, the air pressure will decreasing in lungs and atmospheric air becoming greater.

Source of picture:
Wikispaces (p. d.) SBI3C respiratory system, https://bio3c.wikispaces.com/cecilia

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Source:
Boundless, ( 07 Nov. 2016.) Inspiration, https://www.boundless.com/physiology/textbooks/boundless-anatomy-and-physiology-textbook/respiratory-system-22/mechanics-of-breathing-208/inspiration-1023-395/

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Inspiration  (also called inhalationis) is the flow of air into the lungs, accomplished in mammals by the flattening and contraction of the diaphragm.