5 Questions
Which ion binds to troponin, displacing tropomyosin and exposing the myosin binding sites on actin?
Calcium ions
What regulatory protein blocks the crossbridge binding sites on actin when a muscle is relaxed?
Tropomyosin
Where are calcium ions stored in a muscle fiber?
Sarcoplasmic reticulum
What triggers the release of calcium ions in response to signals from the nervous system to contract?
Transmitter molecules from a neuron
What happens to the sarcomeres in myofibrils during muscle contraction?
They shorten
Test your knowledge of muscle physiology and the process of muscle contraction with this quiz. Learn about the role of calcium ions, troponin, and tropomyosin in regulating muscle movement.
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