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Involuntary muscles are muscles that are not controllable consciously, and instead contract due to unconscious impulses sent by the autonomic nervous system or certain specialized cells or hormones. Both smooth muscle and cardiac muscle can be classified as involuntary muscles. Smooth muscle is comprised of spindle-shaped cells that have no striations and is found in numerous locations throughout the human body. Cardiac muscle is striated rather than smooth, and is found only within the walls of the heart. Smooth muscles are involuntary muscles composed of thick and thin protein filaments that are homologous to the organelles known as myofibrils found in skeletal muscles. The thin filaments are composed of a globular protein called actin, while the thick ones are made up of a motor protein called myosin. Smooth muscles require extracellular calcium ions to contract: the ions activate a nucleotide called Adenosine triphosphate (ATP), which then activates the myosin filaments. The myosin filaments attach to the actin filaments in a process known as the crossbridge cycle, which causes the thick and thin filaments to slide over each other and contract. When the myosin filaments release the actin filaments, the muscle relaxes.
What else can I help you with?
Is the neck a voluntary or involuntary muscle?
neck muscle is voluntary muscle i think this is correct
What is a voluntary muscle?
Voluntary muscle is the one we can control. For example, the skeletal muscle.
Is my calf voluntary or involuntary?
voluntary
Can a smooth muscle be voluntary?
yes it is.....
Is your skeletal muscle involuntary or voluntary?
Voluntary
What is a muscle that you control?
A voluntary muscle.
What is a skeletal muscle and is it voluntary or involuntary?
The skeletal muscle covers and clings to the body skeleton. It is responsible for body movement and is voluntary because it is under our conscious control unlike the cardiac muscle which is responsible for the heart beat
Is a skeletal muscle a voluntary muscle?
Almost all skeletal muscles are voluntary. But respiratory muscles, diaphragm and intercostal, are not completely voluntary.
What can you do with voluntary muscle?
voluntary muscles can normally be controlled at will
Are a leg muscle go to voluntary or involuntary?
Voluntary :)
Is skeletal muscle voluntary or involuntary?
Skeletal muscle is voluntary, meaning it is under conscious control.
Is the smooth muscle voluntary or involuntary?
Smooth muscles are involuntary, as are cardiac muscles. Only skeletal muscles are voluntary.
