The area in the center of the A band that contains no thin filaments is the
A) Z line.
B) M line.
C) H band.
D) I band.
E) zone of overlap.
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Question 2) The skeletal muscle complex known as the triad consists of
A) actin, myosin, and titin filaments.
B) a transverse tubule and two terminal cisternae.
C) filaments, myofibrils, and sarcomeres.
D) A bands, H bands, and I bands.
E) actin, myosin, and sarcomeres.
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Question 3) The region of the sarcomere containing the thick filaments is the
A) Z line.
B) M line.
C) H band.
D) A band.
E) I band.
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Question 4) Which of the following best describes the term Z line?
A) protein that accounts for elasticity of resting muscle
B) repeating unit of striated myofibrils
C) storage site for calcium ions
D) thin filaments are anchored here
E) largely made of myosin molecules
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Question 5) Which of the following best describes the term sarcoplasmic reticulum?
A) protein that accounts for elasticity of resting muscle
B) repeating unit of striated myofibrils
C) storage and release site for calcium ions
D) thin filaments are anchored here
E) largely made of myosin molecules
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Question 6) Muscle fibers differ from typical cells in that muscle fibers
A) lack a plasma membrane.
B) have many nuclei.
C) are very small.
D) lack mitochondria.
E) have large gaps in the cell membrane.
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Question 7) Which of the following best describes the term sarcomere?
A) protein that accounts for elasticity of resting muscle
B) repeating unit of striated myofibrils
C) storage site for calcium ions
D) thin filaments are anchored here
E) largely made of myosin molecules
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Question 8) The plasma membrane of a skeletal muscle fiber is called the
A) sarcolemma.
B) sarcomere.
C) sarcosome.
D) sarcoplasmic reticulum.
E) sarcoplasm.
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Question 9) The repeating unit of a skeletal muscle fiber is the
A) sarcolemma.
B) sarcomere.
C) sarcoplasmic reticulum.
D) myofibril.
E) myofilament.
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Question 10) Skeletal muscle fibers are formed from embryonic cells called
A) sarcomeres.
B) myofibrils.
C) myoblasts.
D) fascicles.
E) myomeres.
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