movement in the body difficult question class 6
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Answer:
Moving may be difficult because of disorders that restrict joint motion or that cause weakness, stiffness, tremor, or difficulty initiating movement (for example, Parkinson disease). Movement may also be limited when motion causes pain. People with pain in the muscles, ligaments, bones, or joints (see Introduction to the Biology of the Musculoskeletal System) tend to consciously and unconsciously limit motion. This limitation of motion often gives the impression of weakness even though the nervous system and muscles are able to generate movement.
Joint disorders
A joint may have limited range of motion because of
Pain
Previous joint injury causing significant scar tissue
Prolonged joint immobilization (for example, when a person's arm is paralyzed by a stroke or placed in a sling) causing shortening of the tendons
Fluid accumulation in a joint resulting from arthritis or an acute injury (giving a sensation that the joint is locked)
A piece of torn cartilage (resulting from an injury, typically in the knee) that blocks joint movement
Weakness
Although many people complain of weakness when they feel tired or run down, true weakness means that full effort does not generate normal, strong muscle contractions. Normal voluntary muscle contraction requires the brain to generate a signal that then travels through the spinal cord and nerves to reach a normally functioning muscle. Therefore, true weakness can result from injury or disease affecting the nervous system, muscles, or connections between them (neuromuscular junction)
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