Question

Osteoporosis is an age-related disease of the skeleton system, may occur thanks to
(A) Decreased level of estrogen
(B) Accumulation of acid resulting in inflammation of joints
(C) Immune disorder affecting myoneural junction resulting in fatigue
(D) High concentration Ca ion and Na ion

Answer 1

Osteoporosis may be a condition during which bones become weak and brittle. The body constantly absorbs and replaces bone tissue. Due to osteoporosis, new bone creation doesn't begin again with old bone removal.

Complete answer:
Osteoporosis is more common in people that have an excessive amount of or insufficient of certain hormones in their bodies. Examples include:
Sex hormones: Lowered steroid hormone levels tend to weaken bone. The reduction of estrogen levels in women at menopause is one of the strongest risk factors for developing osteoporosis.
Men have a gradual decrease in testosterone levels as they become aged.

Option (A) Decreased level of estrogen: Osteoporosis is an age-related disorder of the skeleton caused thanks to the weakening of bones by decreased $C{a^{ + + }}$ and estrogen levels. Estrogen enables reducing the resorption of bone by diminishing osteoclastic activity. because the estrogen levels decrease, the osteoclastic activity increases and more $C{a^{ + + }}$ is withdrawn into the blood from the bone leading to osteoporosis.
Option (B)Accumulation of acid resulting in inflammation of joints: This option isn't correct.
Option (C)Immune disorder affecting myoneural junction resulting in fatigue: This option isn't correct.
Option (D)High concentration Ca ion and Na ion: This option isn't correct.

Thus, the right option is Option (A) Decreased level of estrogen.

Note:
Osteoporosis is more likely to occur in people that have: Low calcium intake. A lifelong lack of calcium plays a task in the development of osteoporosis. Low calcium intake contributes to reduced bone density, fast bone loss, and a high risk of fractures.