Adaptation of voluntary muscle tissues

Adaptation of voluntary muscle tissues

• Voluntary muscle tissues in animals act as a component of the locomotory apparatus. They are usually attached to bone, a strategic for to be involved in locomotion
• Each muscle fiber consists of numerous fibers containing numerous, long cylindrical, unbranched and elastic myofibrils. This allows the muscle to exert a wide range of influence when it contracts. The elasticity also allows it to regains its original length after stretching.
• The myofibrils are arranged parallel to one another. This allows them to slide over one another during contraction and relaxation.
• Each muscle fiber has intimate connection with the motor portion of the voluntary nervous system. This enable it to respond to actions of this section of the nervous system in response to changes in the environment.
• The muscle has a dense network of blood capillaries. This ensures efficient supply of oxygen and nutrient to, and removal of waste product of respiration from, the muscle. This improves efficiency of the muscle.
• Muscle fiber is surrounded by T-tubule that facilitates potential propagation.
• The muscle contains myoglobin instead of hemoglobin in the blood. Myoglobin has a higher affinity for oxygen than hemoglobin. This ensures that enough oxygen is provided to muscle even at low oxygen tensions of the blood flowing through the muscle.
• The fluid bathing the myofibrils contains numerous glycogen granules and mitochondria. This ensures that enough energy, in form of ATP, is always available to the muscle for use in contraction.

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