Pressure changes relate to breathing and circulation from "summary" of Physics of the Human Body by Richard P. McCall
The concept of pressure changes in relation to breathing and circulation is essential to understanding how the human body functions. When we inhale, the diaphragm and intercostal muscles contract, causing the volume of the thoracic cavity to increase. This increase in volume results in a decrease in pressure within the lungs, creating a pressure gradient between the lungs and the atmosphere. As a result, air flows into the lungs to equalize the pressure. Conversely, during exhalation, the diaphragm and intercostal muscles relax, causing the volume of the thoracic cavity to decrease. This decrease in volume leads to an increase in pressure within the lungs, creating a pressure gradient that forces air out of the lungs and back into the atmosphere. These pressure changes are crucial for the process of breathing, allowing us to take in oxygen and expel carbon dioxide. Pressure changes also play a significant role in circulation. The heart acts as a pump, generating pressure that propels blood through the arteries, ...
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