B2 - Muscle placement
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What is actin?
• a protein filament
What is myosin?
• thick protein filament
What is the beginning of a muscle contraction?
• an impulse is sent from the brain known as ‘action potential’ • when action potential reaches the muscle, it stimulates a reaction in each sarcomere of that muscle • receiving this action potential stimulates the ‘myosin head’ to reach out and attach to the actin
What is calcium’s role in muscle contraction?
• calcium allows the myosin and actin to bind together • in order for the process to work, there must be calcium in the sarcomere, and ATP (energy)
What are skeletal muscles used for?
• not only provide movement, strength and power, responsible for … • maintaining posture • generating heat to maintain normal body temperature