Question

Progressive degeneration of skeletal muscle, mostly due to genetic disorder occurs in
A. Myasthenia gravis
B. Muscular dystrophy
C. Arthritis
D. Tetany
E. Osteoporosis

Answer 1

Hint:- Skeletal muscle is one of the major muscle types of the human body. Each skeletal muscle has integrated tissues which includes the skeletal muscle fibres, nerve fibres, connective tissue and blood vessels. Most common skeletal disorders are Myopathy, Myasthenia gravis, Myositis, Multiple sclerosis, and Muscular dystrophy etc.

Complete step-by-step solution:-Skeletal muscles are only muscle tissues which function voluntary actions of the human body that a human performs consciously. Main characteristics of skeletal muscle disorders are muscle weakness, pain, maybe paralysis, skin rashes, absence of coordination in voluntary actions etc.
 Myasthenia gravis is a neuromuscular disorder that causes lack of coordination in muscle movements due to weakness in muscles due to breakdown in communication between muscles and nerves. It is an autoimmune disorder, not inherited muscle disorder.
Arthritis is a joint disorder due to breakdown of cartilage tissue and also due to immune system attack to joints. It is also not an inherited skeletal muscle disorder.
Tetany condition occurs due to low calcium levels in blood (hypocalcaemia). There is no connection between tetany and genetic skeletal muscle disorder.
Osteoporosis is a condition in which bones become brittle and weak and it increases bone fracture. It is also not connected with genetic skeletal muscle disorder.
Muscular dystrophy is a genetic disorder which causes progressive weakness in skeletal muscles and also causes loss of muscle mass due to gene mutation which interferes with production of muscle proteins.
The correct answer is option B - Muscular dystrophy.

Note:-
There is no permanent cure for muscle dystrophy disorder. In this disease or disorder muscles undergo degeneration due to mutation. Some treatments like surgery, exercise and proper medication can help to extend the life time of a person with such disease.