Q. Osteoporosis, age-related disease of skeletal system, may occur due to
A) immune disorder affecting neuro-muscular junction leading to fatigue
B) high concentration of $Ca^{++}$ and $Na^+$
C) decreased level of estrogen
D) accumulation of uric acid leading to inflammation of joints
Explanation
[Solution] Low estrogen (e.g. after menopause) reduces bone mass. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.