Excitation-contraction coupling requires which of the following substances?
A) Ca2+ and ATP
B) Ca2+ only
C) ATP only
D) ATP and glucose
Answer: A
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Muscles and Muscle Tissue
- Which of the following statements is false or incorrect?
- What part of the sarcolemma contains acetylcholine receptors?
- Hypothetically, if a muscle were stretched to the point where thick and thin filaments no longer overlapped, ________.
- Of the following muscle types, which has only one nucleus, no sarcomeres, and rare gap junctions?
- Three discrete types of muscle fibers are identified on the basis of their size, speed, and endurance. Which of the following athletic endeavors best represents the use of red fibers?
- What is the most distinguishing characteristic of muscle tissue?
- Which of the following statements is most accurate?
- After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction?
- The sliding filament model of contraction involves ________.
- Muscle tone is ________.
- An anaerobic metabolic pathway that results in the production of two net ATPs per glucose plus two pyruvic acid molecules is ________.
- Which of the following statements is true?
- The giant protein titin maintains the organization of the ________ assisting in muscle stretching.
- Muscle tissue has all of the following properties except ________.
- Smooth muscle is characterized by all of the following except ________.
- Which of the following is true about smooth muscle?
- Which of the following is not a role of ionic calcium in muscle contraction?
- Which of the following describes the cells of unitary smooth muscle?
- The mechanism of contraction in smooth muscle is different from skeletal muscle in that ________.
- Which of the following is the correct sequence of events for muscle contractions?
- The muscle cell membrane is called the ________.
- In an isotonic contraction, the muscle ________.
- When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?
- During vigorous exercise, there may be insufficient oxygen available to completely break down pyruvic acid for energy. As a result, the pyruvic acid is converted to ________.
- Which of the following is not a connective tissue sheath that wraps individual muscle fibers?