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20 Cards in this Set
- Front
- Back
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Which of the following is NOT a function of the muscular system:
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E. hematopoiesis
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A sarcomere is:
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B. the contractile unit between two Z discs
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Which one of the following is composed of myosin protein:
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A. thick filaments
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Why are calcium ions necessary for skeletal muscle contraction:
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C. calcium triggers the binding of myosin to actin
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The mechanical force of contraction is generated by:
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C. a sliding of thin filaments past thick ones
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Acetylcholine is:
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E. a neurotransmitter that stimulates skeletal muscle contraction
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The gap between the axon terminal of a motor neuron and the sarcolemma of a skeletal muscle cell is called the:
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D. synaptic cleft
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An elaborate and specialized network of membranes in skeletal muscle cells that function in calcium storage is the:
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E. sarcoplasmic reticulum
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During skeletal muscle contraction, myosin heads attach to active sites of:
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B. actin filaments
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Which of these events must occur first to trigger the skeletal muscle to generate an action potential and contract:
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B. acetylcholine (ACh) causes temporary permeability to sodium
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Creatine phosphate (CP) functions within the muscle cells by:
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D. storing energy that will be transferred to ADP to resynthesize ATP as needed
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The movement opposite to abduction is:
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D. adduction
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Which of the following muscles closes the jaw:
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E. both masseter and temporalis
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Which of these muscles is NOT located in the head:
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D. sartorius
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Which one of the following does NOT compress the abdomen:
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D. latissimus dorsi
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A nursing infant develops a powerful sucking muscle that adults also use for whistling or blowing a trumpet called the:
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D. buccinator
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What is the main function of the quadriceps femoris group:
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D. knee extension
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Which one of the following is the action of the orbicularis oris:
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A. closes, purses, and protrudes the lips
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Paralysis of which of the following would make an individual unable to flex the hip:
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E. iliopsoas
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Which one of the following muscles is involved in abduction of the arm at the shoulder joint:
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A. deltoid
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