Practice question

Correct option is B, Ease of lung expansion. In Cardiac Cycle and Regulation, the accurate description is Ease of lung expansion, and that is what you should commit to memory. Keep the definition tight and the role clear — this is mainly a definition check, and Ease of lung expansion is the standard term or meaning used in Cardiac Cycle and Regulation. Then Ease of lung expansion is the answer you can defend. Check yourself by covering the options and writing the answer first, then matching the letter — that builds confidence. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto Ease of lung expansion.