Test: Movement and Locomotion - Joints and Disorders (September 14) - NEET MCQ

Pivot joint allows only a rotatory movement of one bone on the other, which remains stationary. A rounded end of one bone fits into a shallow pit of another bone. E.g., joint between atlas and axis vertebrae which enables the head to turn from side to side.

The gliding joint allows sliding movements of two bones over each other. The joint between zygapophyses of successive vertebrae is of this type.

In a ball and socket joint, a ball like structure o bone fits into a socket like structure of another bone between acetabulum (cotyloid cavity) of pelvic girdle (hip girdle) and head of femur is an example of ball and socker joint.

Only tibia connects to the femur to form the knee joint with the patella. Shoulder joint is of ball-and-socket type and elbow joint is a hinge joint.

Pivot joint — between atlas and axis.
Saddle joint — between carpal and metacarpal.

Myasthenia gravis is an autoimmune disorder of the muscular system which affects neuromuscular junctions. Crohn’s Disease, Celiac Disease and gastroenteritis are disorders of the digestive system.

Myasthenia gravis is an autoimmune disorder which affects neuromuscular junctions. It leads to fatigue, muscle weakness and paralysis of skeletal muscles. Rapid spasms are a result of tetany.

Muscular dystrophy is a genetic disorder of the muscular system. It leads to the progressive degeneration of skeletal muscles and loss of muscle mass. The life span of patients is often shortened.

Tetany is a disorder of the muscular system characterized by rapid spasms or wild contractions. It occurs due to low concentrations of calcium ions in body fluids. Calcium ions play an important role in muscle contraction.

Muscular dystrophy, gout, tetany and osteoporosis are disorders of the muscular system and the skeletal system. Out of these, tetany is caused due to low concentrations of calcium ions.