muscle fibre

• Célula alargada del tejido muscular, compuesta de miofibrillas y encargada de la contracción y el movimiento en el organismo.

A single cell of muscle tissue, composed of myofibrils and responsible for contraction and movement in the body.

1. Skeletal muscle cellB2formal

   A long, cylindrical cell that makes up skeletal muscle tissue, responsible for voluntary movement.

   fibra muscular esquelética

   • Skeletal muscle fibres are multinucleated and striated.
   • Regular exercise increases the size of muscle fibres.
   • The contraction of a muscle fibre is triggered by a nerve impulse.

2. Structural unit of muscleB2formal

   The basic structural and functional unit of any muscle tissue, including cardiac and smooth muscle.

   fibra muscular

   • Cardiac muscle fibres are interconnected by intercalated discs.
   • Smooth muscle fibres are spindle-shaped and lack striations.
   • Damage to muscle fibres can result from intense physical activity.