heart rate and expiration decreases heart rate.
Inspiration or inhalation refers to bringing fresh air into the lungs from the external environment. This is done by creating a pressure differential between the Lungs and the atmosphere.
Diaphragmatic contraction toward the abdominal cavity occurs when air enters the lungs, enhancing the thoracic cavity's capacity to hold the breathed air.When the external intercostal muscles are simultaneously contracted, the anteroposterior axis volume of the thoracic chamber increases.
During exhalation the air is breathed out. The diaphragm and ribs move in opposite directions during exhalation.
The ribs are lowered as the external intercostal muscles relax. As a result, the diaphragm rises back to its starting position.Consequently, the thoracic cavity shrinks and the lungs are squeezed, which results in the lungs expelling more air.
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