Muscles that are used for precisely controlled movements generally contain large motor units.
Indicate whether this statement is true or false.
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Question 2) __________ is a protein that anchors myofibrils that are adjacent to the sarcolemma to proteins in the sarcolemma.
Fill in the blank with correct word.
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Question 3) Which structures are reservoirs that store acetylcholine?
A. Synaptic vesicles
B. Synaptic clefts
C. Terminal cisternae
D. Lysosomes
E. Sarcomeres
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Question 4) Myoglobin is a molecule within muscle cells that can bind
A. creatine phosphate.
B. oxygen.
C. hemoglobin.
D. acetylcholine.
E. ATP.
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Question 5) A sarcomere is defined as the distance from one _____ to the next adjacent ____ . (The same answer fills in both spaces.)
A. Z disc
B. I band
C. H zone
D. A band
E. M line
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Question 6) A skeletal muscle cell contains hundreds to thousands of _________, which are complex organelles; they are cylindrical in shapeabout 2 micrometers in diameter and as long as the cell.
A. myofibrils
B. microfilaments
C. sarcomeres
D. T-tubules
E. sarcolemma
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Question 7) Which letter is associated with a zone (in a relaxed muscle) that is a little more lightly shaded because only thick filaments are present?
A. I
B. A
C. M
D. Z
E. H
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Question 8) Which letter is associated with the line that is a thin protein structure that serves as an attachment site for thin filament ends?
A. I
B. A
C. Z
D. M
E. H
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Question 9) Each thick filament contains about ______ protein molecules (each molecule has two heads and two braided tails).
A. 2
B. 20
C. 200
D. 2000
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Question 10) Which of the following structures has the active sites to which the heads of the thick filaments will bind?
A. Actin
B. Troponin
C. Tropomyosin
D. Myosin
E. Sarcoplasm
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