1. Problem- Analysis-Solution(向解决法 Back Analysis of effects of iron deficiency: (Paras. 7-8) (1) Fatigue and poor performance may begin to appear when not enough iron is present in their blood to form the molecules of blood protein that transport oxygen to the working muscles.(2)When their iron reserves go to zero, people often feel weak, tired, and out of breath -and their exercise performance is severely compromised; and they are in trouble. >>>more>>>more Analysis of effects of iron deficiency: ?(Paras. 7 - 8) (1) Fatigue and poor performance may begin to appear when not enough iron is present in their blood to form the molecules of blood protein that transport oxygen to the working muscles. (2) When their iron reserves go to zero, people often feel weak, tired, and out of breath — and their exercise performance is severely compromised; and they are in trouble. Back 1. Problem-Analysis-Solution (问题解决法)