Striations are only found in skeletal muscle. A. True B. False 2. Inward extensions of the sarcolemma that wrap around each myofibril allowing the action potential to reach deep into the muscle fiber are called _______________. A. sarcoplasmic reticulum B. terminal cisternae C. sarcomere D. Transverse tubules 3. Which of the following is the largest structure? A. myofilaments B. myofibrils C. muscle fibers D. fascicles
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B. False - Striations are also found in cardiac muscle. Show more…
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1. A skeletal muscle fiber contains all of the following except Group of answer choices a sarcoplasmic reticulum myosin vesicles of acetylcholine actin 2. The sliding filament theory states that: the thin filaments shorten which decreases the overall length of the sarcomere the thin filaments slide toward the center of the sarcomere while the thick filaments stay stationary the thick filaments slide toward the center of the sarcomere while the thin filaments stay stationary thin and thick filaments never interact with one another during muscle contraction
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Which of the following is not a type of muscle? A, Hyaline B. Cardiac C. Skeletal D. Smooth 2.For muscle contraction to occur, ______________ is released from the sarcoplasmic reticulum and binds with ____________ . A) sodium, tropomyosin B) calcium, troponin C) calcium, tropomyosin D) sodium, troponin 3) Match the function to the correct body system. A) Skeletal system B) Muscular System 1. Protects the brain, spinal cord and rib cage. 2. Maintains posture and joint stability 3. Heat production for temperature homeostasis 4. Stores minerals and lipids (fat) 4) Which type of muscle is involuntary, non-striated and found in the walls of hollow organs such as the intestines and blood vessels? Why is it important for body homeostasis that this type of muscle is involuntary?
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Which of the following is true about skeletal muscle? A. In the muscle fibre, actin is the thick filament. B. The sarcoplasmic reticulum regulates the level of Ca ^2 + within a muscle cell. C. Unlike a nerve cell, a muscle cell does not possess an excitable membrane. D. In a muscle fibre, myosin is the thin filament. E. Contraction of a muscle fibre can occur in the absence of Ca ^2 + .
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