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27 Cards in this Set
- Front
- Back
The thin myofilament of the skeletal muscles are made of:
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actin
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The thick myofilament of the skeletal muscles are made of:
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myosin
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The basic contractile unit of a skeletal muscle is the:
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sarcomere
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When a muscle contraction occurs:
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the Z lines are pulled closer together
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According to the sliding filament model, in order for a sarcomere to contract:
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- bridges must form between the actin and myosin
- calcium must be released from the endoplasmic reticulum - ATP must be broken down for energy |
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To produce smooth movement at a joint:
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the prime mover and synergists must contract
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The point of contract between the nerve and the muscle fibers it stimulates is called a:
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neuromuscular junction
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The minimal level of stimulation required to cause a fiber to contract is called:
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a threshold stimulus
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What allows you to lift different weights with the same muscle is the:
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number of motor units used by the muscle
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The muscle contracts and shortens and the insertion end moves toward the point of origin. This describes:
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isotonic contractions
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The muscle contracts but does not shorten, but an increase in muscle tension occurs. This describes:
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isometric contractions
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Endurance training leads to:
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an increased number of blood vessels to the muscle
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Which of the following muscles are muscles that move the upper extremities?
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biceps brachii, triceps brachii, latissimus dorsi
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Which of the following muscles are muscles that move the lower extremities?
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sartorius, iliopsoas, gracilis
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This refers to ankle and foot movement:
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dorsiflexion
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The movement that is opposite dorsiflexion is:
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plantar flexion
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Moving a part of the body away from the midline of the body is called:
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abduction
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This describes the hand position when the body is in anatomical position:
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supination
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Myasthenia gravis is:
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an autoimmune disease
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Duchenne muscular dystrophy is:
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also called pseudohypertrophy
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Poliomyelitis is:
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caused by a viral infection
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Intercalated disks are found in:
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cardiac muscle
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Another name for smooth muscle is:
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visceral muscle
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The muscle attachment to the more movable bone is called the:
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insertion
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The connective tissue that attaches muscle to bone is called:
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tendon
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If an injury caused damage to the insertion of the biceps brachii muscle (the anterior muscle of the upper arm), the injury would be nearest to:
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the elbow
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Striations are found in:
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skeletal muscle and cardiac muscle
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