Answer the following question given this paragraph: The release of calcium ions initiates muscle contractions. Watch this video (http://openstaxcollege. org/l/calciumrole) to learn more about the role of calcium. (a) What are "T-tubules" and what is their role? (b) Please describe how actinbinding sites are made available for cross-bridging with myosin heads during contraction. Q: The release of calcium ions initiates what? Choices: - exhalation - cramps - spasms - muscle contractions A:
Answer:
muscle contractions