What Muscle Tissue Type Is Responsible for Voluntary Movement?
Skeletal muscle is the muscle tissue type responsible for voluntary movement. This type of muscle is attached to bones and joints and is controlled by the somatic nervous system. Skeletal muscle fibres are long, cylindrical cells that contain multiple nuclei. They are striated, meaning that they have alternating light and dark bands when viewed under a microscope. This striation is due to the arrangement of the actin and myosin filaments within the muscle fibres.
When a nerve impulse reaches a skeletal muscle fibre, it causes the release of calcium ions from the sarcoplasmic reticulum, a specialised organelle within the muscle fibre. Calcium ions bind to receptors on the surface of the sarcoplasmic reticulum, causing a conformational change that allows calcium ions to flow into the cytosol. This increase in cytosolic calcium concentration triggers the contraction of the muscle fibre.
Voluntary movement is essential for everyday activities such as walking, talking, and eating. Skeletal muscle is also responsible for maintaining posture and stabilising joints.
Related Questions
- What is the difference between voluntary and involuntary muscle?
- How is skeletal muscle innervated?
- What is the role of calcium ions in muscle contraction?
- What are the different types of skeletal muscle fibres?
- How can skeletal muscle be strengthened?
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