25. During exercise, Inspiration requires more force and extra labor is placed on the muscles of the Thorax. Which of the following statements is true regarding the mechanisms of "forced inspiration"? A. The diaphragm is able to triple the force of a normal contraction and subsequently increase thoracic volume by 50%. B. The external intercostal muscles contract and assist with the decrease in intrathoracic pressure. C. The internal intercostal muscles contract and assist with the decrease in intrathoracic pressure. D. Lung Elastic Recoil decreases (in response to circulating Epinephrine) and the load on the diaphragm is diminished.

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