Which curve best represents the aerobic energy expenditure? (A) W (B) X (C) Y (D) Z - HSC - SSCE Personal Development and Physical Education - Question 18 - 2011 - Paper 1

To determine which curve best represents aerobic energy expenditure, we need to understand the characteristics of aerobic metabolism. Aerobic energy expenditure typically increases gradually with exercise intensity until it plateaus once steady-state is achieved. Among the options presented, curve B is most likely to represent a smooth increase followed by a plateau, indicating that it corresponds to aerobic energy expenditure.