In several disorders that involve muscle dysfunction — such as amyotrophic lateral sclerosis, spinal muscular atrophy and myasthenia gravis — muscle weakness results from limited neuronal input into ...

Hierarchical structure of muscle and activation of thin filaments. In both skeletal and cardiac muscles under a relaxed state, a low intracellular calcium ion concentration is maintained and the ...

Troponin refers to three different proteins that help regulate the contractions of the heart and skeletal muscles. Normal troponin levels range from 0 to 0.04 nanograms per milliliter (ng/ml). The ...