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| 1 | |
Individual skeletal muscle cells are known as |
| | A) | myotomes |
| | B) | myofilaments |
| | C) | muscle fibers |
| | D) | myofibrils |
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| 2 | |
All of the following are functions of skeletal muscle tissue except |
| | A) | cooling of the body |
| | B) | body movement |
| | C) | maintenance of posture |
| | D) | storage and movement of materials |
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| 3 | |
The three types of muscle tissue are |
| | A) | voluntary, involuntary, and cardiac |
| | B) | skeletal, cardiac, and smooth |
| | C) | striated, skeletal, and voluntary |
| | D) | striated, unstriated, and rough |
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| 4 | |
The layer of dense irregular connective tissue that surrounds the entire skeletal muscle is the |
| | A) | sarcolemma |
| | B) | perimysium |
| | C) | endomysium |
| | D) | epimysium |
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| 5 | |
What is the cell membrane of a muscle fiber called? |
| | A) | endomysium |
| | B) | sarcomere |
| | C) | sarcolemma |
| | D) | myofibril |
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| 6 | |
Each of the following is an attribute of skeletal muscle fibers except |
| | A) | lack striations |
| | B) | long and large in diameter |
| | C) | possess transverse tubules |
| | D) | multinucleated |
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| 7 | |
A thick, fibrous connective tissue cord that attaches a muscle to a bone is called |
| | A) | a ligament |
| | B) | a tendon |
| | C) | a raphe |
| | D) | an aponeurosis |
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| 8 | |
What are the principal proteins of muscle contraction? |
| | A) | actin and myoglobin |
| | B) | actin and myosin |
| | C) | myoglobin and collagen |
| | D) | myosin and myoglobin |
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| 9 | |
Which structures extend into the sarcoplasm as a network of deep invaginations of the sarcolemma? |
| | A) | transverse tubules |
| | B) | sarcoplasmic reticula |
| | C) | terminal cisternae |
| | D) | cross-bridges |
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| 10 | |
The functional contractile units of a skeletal muscle fiber are the |
| | A) | myofilaments |
| | B) | transverse tubules |
| | C) | sarcomeres |
| | D) | sarcolemmae |
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| 11 | |
A nerve impulse triggers the release of what chemical at a neuromuscular junction? |
| | A) | adenosine triphosphate (ATP) |
| | B) | acetylcholinesterase (AChE) |
| | C) | acetylcholine (ACh) |
| | D) | none of the above |
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| 12 | |
Which term describes the expanded tip of an axon at a neuromuscular junction? |
| | A) | synaptic vesicle |
| | B) | motor end plate |
| | C) | synaptic cleft |
| | D) | synaptic knob |
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| 13 | |
Which part of a sarcomere contains entire thick filaments and lateral end regions with overlapping thin filaments? |
| | A) | M line |
| | B) | A band |
| | C) | I band |
| | D) | H zone |
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| 14 | |
When a muscle fiber contracts, what slides toward the center of each sarcomere? |
| | A) | the thin filaments of actin |
| | B) | the thick filaments of myosin |
| | C) | both a and b |
| | D) | neither a nor b |
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| 15 | |
A reduction in muscle size, tone, and power is called |
| | A) | atrophy |
| | B) | a spasm |
| | C) | hypertrophy |
| | D) | hyperplasia |
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| 16 | |
A muscle impulse travels deep into the muscle fiber along |
| | A) | the sarcolemma |
| | B) | T-tubule membranes |
| | C) | the endomysium |
| | D) | myofibrils |
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| 17 | |
A single motor neuron, the muscle fibers it controls, and the neuromuscular junctions in between constitute a |
| | A) | sarcomere |
| | B) | motor end plate |
| | C) | motor unit |
| | D) | synaptic terminal |
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| 18 | |
When stimulated by a muscle impulse, what do the terminal cisternae release into the sarcoplasm? |
| | A) | sodium ions, Na+ |
| | B) | calcium ions, Ca2+ |
| | C) | adenosine triphosphate, ATP |
| | D) | acetylcholine, ACh |
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| 19 | |
The arrangement of tendons and fascicles in a ____________ muscle resembles the structure of a feather. |
| | A) | pennate |
| | B) | parallel |
| | C) | circular |
| | D) | convergent |
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| 20 | |
Types of skeletal muscle fibers include |
| | A) | fast |
| | B) | intermediate |
| | C) | slow |
| | D) | all of the above |
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| 21 | |
Muscle fibers are arranged concentrically in |
| | A) | pennate muscles |
| | B) | circular muscles |
| | C) | convergent muscles |
| | D) | parallel muscles |
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| 22 | |
Types of pennate muscles include which of the following? |
| | A) | multipennate |
| | B) | bipennate |
| | C) | unipennate |
| | D) | all of the above |
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| 23 | |
Attributes of a convergent muscle include all of the following except |
| | A) | direction of pull can be changed readily |
| | B) | does not pull as forcefully as a parallel muscle of equal size |
| | C) | widespread muscle fibers converge on a common attachment site |
| | D) | fascicles insert obliquely onto a tendon extending through the muscle |
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| 24 | |
The most common levers in the body are ____________ levers. |
| | A) | first-class |
| | B) | second-class |
| | C) | third-class |
| | D) | fourth-class |
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| 25 | |
Most muscles are attached at one end to a less movable point known as the |
| | A) | insertion |
| | B) | origin |
| | C) | tendon |
| | D) | belly |
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| 26 | |
A muscle is classified functionally as an agonist when |
| | A) | it is the main muscle that contracts to produce a particular movement |
| | B) | it contracts together with another muscle to assist in a given action |
| | C) | its contraction prevents movement and thereby stabilizes a joint |
| | D) | its actions work in opposition to the movement being considered |
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| 27 | |
Which of the following describes a first-class lever? |
| | A) | the fulcrum is situated between the force and the resistance |
| | B) | the resistance is located between the fulcrum and the applied force |
| | C) | a force is applied between the resistance and the fulcrum |
| | D) | none of the above |
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| 28 | |
All of the following characteristics are used in naming muscles except |
| | A) | size |
| | B) | action |
| | C) | shape |
| | D) | color |
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| 29 | |
The deltoid muscle is named on the basis of its |
| | A) | action |
| | B) | size |
| | C) | shape |
| | D) | attachment |
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| 30 | |
Of the following terms used in muscle names, which one refers to a specific body region? |
| | A) | fibularis |
| | B) | gluteus |
| | C) | trapezius |
| | D) | quadriceps |
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