Muscle myofibrils are arranged longitudinally into sarcomeres. Which of the following correctly lists the boundaries of a single sarcomere?

Where can you find a ryanodine receptor?

Which specific protein of troponin is responsible for attaching the troponin complex to tropomyosin?

In a muscle cell, the H-zone has __________.

During muscle contraction, which band(s) of the sarcomere shorten(s)?

An investigational drug prevents skeletal muscle contraction by preventing ATP hydrolysis at the active site in muscle tissue. Where is this drug most likely to act?

Where within the sarcomere is myosin contained?

Troponin binds with which ion?

Which of the following sarcomere portions does not decrease in length during muscular contraction?

Ions are key in mediating muscle contraction. Which of the following structures interacts directly with ions to expose actin binding sites in contracting muscle?