Podcast
Play an AI-generated podcast conversation about this lesson
Questions and Answers
Which ion binds to troponin, displacing tropomyosin and exposing the myosin binding sites on actin?
Which ion binds to troponin, displacing tropomyosin and exposing the myosin binding sites on actin?
- Potassium ions
- Calcium ions (correct)
- Sodium ions
- Chloride ions
What regulatory protein blocks the crossbridge binding sites on actin when a muscle is relaxed?
What regulatory protein blocks the crossbridge binding sites on actin when a muscle is relaxed?
- Troponin
- Tropomyosin (correct)
- Myosin
- Actinin
Where are calcium ions stored in a muscle fiber?
Where are calcium ions stored in a muscle fiber?
- Sarcoplasmic reticulum (correct)
- Endoplasmic reticulum
- Mitochondria
- Golgi apparatus
What triggers the release of calcium ions in response to signals from the nervous system to contract?
What triggers the release of calcium ions in response to signals from the nervous system to contract?
Signup and view all the answers
What happens to the sarcomeres in myofibrils during muscle contraction?
What happens to the sarcomeres in myofibrils during muscle contraction?
Signup and view all the answers
