Final answer:
The expansion of the lungs during inspiration, which generates a pressure gradient that causes air to flow into the lungs, is indeed an example of Boyle's law, as it demonstrates the inverse relationship between gas pressure and volume.
Step-by-step explanation:
The statement that the expansion of the lungs during inspiration generates a pressure gradient causing air to flow into the lungs is an example of Boyle's law is true. Boyle's law describes how the pressure of a gas is inversely proportional to its volume. When we inhale, the diaphragm contracts and the thoracic cavity expands, which increases the volume of the lungs.
Consequently, per Boyle's law, the pressure within the lungs decreases, creating a pressure gradient with respect to the external environment. This causes air to rush into the lungs. Conversely, during exhalation, the diaphragm relaxes, the thoracic cavity volume decreases, the pressure inside the lungs increases, and air is expelled out of the lungs.