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Chapter 11 Muscular Tissue

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    True
    Extensibility refers to the ability of a muscle to stretch.
    False
    A dark band formed by parallel thick filaments that partly overlap the thin filaments is known as an H band
    True
    The sarcoplasmic reticulum is the smooth ER of a muscle fiber.
    True
    Clinically, dystrophin is the most important noncontractile protein to occur in muscle fibers
    False
    The sliding filament theory of muscle contraction has emerged from research only in the last 10 to 15 years.
    True
    A deficiency of Ach receptors leads to muscle paralysis in myasthenia gravis
    True
    An isometric contraction does not change muscle length
    True
    Some smooth muscle is autorhythmic.
    Smooth muscle
    Which one is most dependent on extracellular Ca2+?
    Skeletal muscle
    Which muscle tissue contracts in response to conscious nervous stimulation?
    Smooth muscle
    Which does not exhibit striations
    Cardiac muscle
    Which has the widest T tubules?
    Smooth muscle
    Which muscle tissue has the greatest capacity for regeneration?
    5
    5
    Which acts during a power stroke?
    4
    Which is predominately made up of myosin?
    1
    1
    Which band contains overlapping thick and thin filaments?
    to neutralize carbon dioxide buildup
    Which of the following is not a purpose of the excess postexercise oxygen consumption in muscle?
    skeletal muscle
    Which muscle type depends solely on the sarcoplasmic reticulum as its calcium source?
    smooth and cardiac muscle
    Which muscle(s) can contract without the need for nervous stimulation?
    in the liver
    Where is lactic acid converted to pyruvic acid?
    5 ATP per second
    During muscle contraction, a single myosin head consumes ATP at a rate of about
    isotonic contraction
    The term for shortening of a muscle while maintaining constant tension is
    type IIB fast glycolytic fibers
    Which fibers are primarily responsible for producing lactic acid?
    intermediate fibers.
    Michael Jordan was arguably the best player in professional basketball history. Scientifically one would expect him to have highly developed
    intercalated discs of cardiac muscle
    Where would you expect to find numerous gap junctions in muscular tissue?
    it does not have Z discs
    The contraction strength of smooth muscle is relatively independent of its resting length partly because
    contracts more rapidly but relaxes more slowly.
    In comparison to skeletal muscle, smooth muscle
    myokinase
    Which of the following is very important for muscle to continue contraction during anaerobic respiration?
    the threshold.
    The minimum stimulus needed to cause muscle contraction is called
    incomplete tetanus.
    If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be
    The muscle lengthens but tension remains constant.
    Which of the following is true concerning isotonic eccentric contraction?
    cardiac muscle
    Which of the following has the largest mitochondria?
    1
    One somatic motor neuron is stimulated by how many muscle fibers?
    synaptic knob
    To stimulate muscle contraction, acetylcholine is released from the ___________ into the
    tetanus
    The absence or inhibition of AChE at a synapse would lead to which of the following?
    to inhibit the function of cholinesterase
    Which statement best describes the goal of medications used to treat myasthenia gravis?
    recruitment
    A single high-voltage stimulation of a muscle will result in
    36
    Aerobic respiration produces approximately _____ more ATPs per glucose molecule than glycolysis does
    longer aerobic respiration
    Athletes who train at high altitudes increase their red blood cell count and thus increase their oxygen supply during exercise. Increased oxygen supply results in
    satellite cells.
    Cardiac muscle has very little capacity for regeneration because it lacks
    goose bumps
    Which of the following would be caused by contraction of smooth muscle?
    two terminal cisternae and one T tubule.
    The triads of a muscle fiber consist of
    recruit more muscle fibers.
    As you are lifting a box someone places extra weight on top of it. For your muscle to continue contracting and lifting the box, the muscle must
    troponin
    The protein that acts as a calcium receptor in skeletal muscle is
    prevent calcium from entering smooth muscle, thus allowing the muscle to relax
    Drugs called calcium channel blockers may be used to lower blood pressure by causing arteries to vasodilate. These drugs
    no effect
    Exposure to Clostridium tetani causes continuous release of ACh. What effect does this have on smooth muscle?
    between the thin myofilaments and the sarcolemma of a muscle fiber.
    Dystrophin, the protein that is defective in muscular dystrophy, is normally found
    Ca2+ accumulates in the sarcoplasm faster than the sarcoplasmic reticulum can reabsorb it.
    A reason that muscle twitches become progressively stronger in treppe is
    to release norepinephrine.
    The purpose of varicosities in muscle physiology is
    donates one of its phosphate groups to ADP.
    Creatine kinase
    increases permeability of the sarcolemma.
    Release of ACh
    The intracellular environment is negatively charged.
    Which of the following best describes the resting membrane potential (RMP)?
    potassium.
    The sarcolemma of a resting muscle fiber is most permeable to
    . The triad allows for Ca2+ release when a muscle fiber is excited.
    What is the purpose of the triad?
    a 22-year-old football player
    Which of the following individuals would have more mitochondria in his skeletal muscle?
    the phosphagen system
    Which of the following systems would provide energy for a racquetball player?
    atrophy
    Loss of muscle mass from lack of activity is termed
    plasticity
    Which of the following is not a characteristic of a muscle cell?
    elastic
    Collagen is
    an elastic filament.
    A myofilament that flanks a thick filament and anchors it to a Z disc is called
    plasticity
    The bladder’s ability to greatly distend and return to normal tension is due to the ___ of smooth muscles
    partially stretched before being stimulated
    A skeletal muscle generates the greatest tension when it is
    make more use of aerobic respiration.
    A volleyball player depends on the gastrocnemius muscles for plantar flexion, whereas a marathon runner depends more on the soleus muscles for the same action. This is because the soleus muscles
    tropomyosin
    In a relaxed muscle fiber, the active sites of actin are blocked by
    striations
    In skeletal muscle, alternating light and dark bands are termed
    increase the average number of myofibrils per muscle fiber.
    The training regimen of a competitive weight lifter is designed partly to

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