Which condition involves the permanent tightening of connective tissues, resulting in nonelastic fibrous tissues?

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The condition described is characterized by the permanent tightening of connective tissues, leading to the formation of nonelastic fibrous tissues, which is exactly what occurs in contractures. A contracture results from the shortening and hardening of muscles, tendons, or other tissues, making it difficult or impossible to move the affected joints effectively. This can occur due to various reasons, such as prolonged immobility, scarring from injury, or certain medical conditions.

In contrast, dyspnea refers to difficulty breathing, which is unrelated to the tightening of connective tissues. Myasthenia gravis is an autoimmune disorder affecting nerve transmission to muscles, leading to weakness but not specifically involving the tightening of connective tissues. Apnea refers to temporary cessation of breathing, which does not relate to the physical characteristics of connective tissues. Therefore, the best fit for the condition described is contracture, as it encompasses the symptoms and causes related to the permanent tightening of connective tissues.

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