True or False: Troponin has a high affinity for calcium ions.
A:) True
B:) False
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Correct Answer:
A:) True
Explanation:
Tropomyosin is a long structure that is blocking the active binding sites on the actin molecule. With tropomyosin blocking the active binding sites, myosin heads cannot interact with the actin molecule’s binding sites and no muscle contraction / movement can occur. During muscle cell activation, the sarcoplasmic reticulum releases calcium into the sarcoplasm. Calcium binds to troponin (troponin is part of the actin myofilament) because troponin has a high affinity for calcium. Calcium binding to troponin causes a conformational shift in tropomyosin (tropomyosin is also part of the actin myofilament), moving it out of the way of active sites on actin. With tropomyosin out of the way, myosin heads can now bind to active sites on actin and muscle contraction / movement can occur.
These CSCS exam practice questions were created to help users study for the Certified Strength and Conditioning Specialist certification exam from the National Strength and Conditioning Association (NSCA). Using CSCS exam practice questions is an efficient way to study the most relevant material for the Certified Strength and Conditioning Specialist exam. CSCS exam practice questions and our CSCS study guide can help you to remember important concepts and test your knowledge of the material in a no-pressure environment. The Certified Strength and Conditioning Specialist designates that a fitness professional has the scientific and practical knowledge necessary to assist athletes to improve their physical performance.
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The Certified Strength and Conditioning Specialist (CSCS) exam by the National Strength and Conditioning Association (NSCA) is a four-hour-long, pencil and paper or computer-based examination. The Certified Strength and Conditioning Specialist exam has two sections: “Scientific Foundations” and “Practical / Applied.” Each of these sections consist of questions that the National Strength and Conditioning Association (NSCA) feels are relevant to test the knowledge and experience of a candidate for the Certified Strength and Conditioning Specialist (CSCS) professional credential. Certified strength conditioning specialist comprehensive questions from the Scientific Foundations section include anatomy, exercise physiology, biomechanics, and nutrition. certified strength conditioning specialist comprehensive questions from the Practical / Applied section include program design, exercise techniques, testing and evaluation, and organization / administration (NSCA, 2015).