Q.8 Write a note on disorders of skeletal system?
Answer:
The following are the disorders of skeletal system:
1. Osteoporosis:
In Osteoporosis, there is a decrease in the density of bones due to the loss of calcium and phosphorus. It is a bone disease in adults especially in old people. It is more common in old women. In women, estrogen deposits minerals in bones. When reproductive cycle stops in female, not enough estrogen is secreted and no minerals are deposited at bones and women becomes victim of osteoporosis.
Causes: 
i. Malnutrition (lack of protein and Vitamin C)
ii. Lack of physical activities
iii. Deficiency of estrogen hormone in women
iv. Decrease in the secretion of growth hormones in old age and it also leads to decreased
deposition of minerals in bone matrix.
2. Arthritis
Introduction:
Arthritis means “inflammation in joints”. It is also very common in old age and in women.
Symptoms
It is characterized by pain and stiffness in joints particularly in the weight bearing joints e.g; in hip; joint and ankle joint etc.
Treatment
It includes pain killer and anti-inflammatory medicines.
Types of Arthritis:
1) Osteoarthritis
It is due to the degeneration in the cartilage present at joints or due to decreased lubricant production at joints. In this arthritis, fusion of the bones at joint may occur and joints may become totally immoveable.
2) Rheumatoid arthritis
It involves the inflammation of the membranes at joints. Its symptoms include fatigue, low grade fever, pain and stiffness in joints.
3) Gout:
It is characterized by the accumulation of uric acid crystals in moveable joints. It generally attacks the toe joints.