Lack of what in the blood can lead to impotence? 
hormones hemoglobin oxygen iron Energy. t-cells competition Energy
A B C D E F G H
Deficiencies in the Endocrine System are another source of impotence.
lack of certain hormones in the blood can cause impotence. 
Lack of what in the blood can lead to impotence?  (A) hormones (B) hemoglobin (C) oxygen (D) iron (E) Energy. (F) t-cells (G) competition (H) Energy