it\'s really A&P but they didn\'t have that as a subject 45-56 ) prevent muscle
ID: 149752 • Letter: I
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it's really A&P but they didn't have that as a subject
45-56
) prevent muscle fatigue S) Approximately 80% of a muscle fiber's volume are the myofibrils. This characteristic reflects muscles ability to A) produce relatively high amounts of ATP B) store oxygen molecules that can be used in acrobic respiration C) produce movement through contractile force D) generate and propagate action potential 46) A muscle that opposes, or reverses, a partieular movement is an) iA) antagonist B)fixator C)synergist D) agonist (prime mover) 47) During muscle contraction, myosin cross bridges attach to which active sites? A) myosin filaments B) actin filaments C)Z discs D) thick filaments 48) Myasthenia gravis is a disease that is believed to be caused by autoimmune disorder, resulting in the loss of ACh receptors at the motor end plate of muscle fibers. Which of the following is likely to be a symptom of myasthenia gravis A) weakness of muscle B) seizures and uncontrollable muscle movement C) coma and loss of voluntary muscle movement D) dehydration with headache 49) When a sarcomere contracts and thin filaments move over thick filaments you would expect to see A) the I bands to appear smaller B) the H zone to appear widerC) the I bands to appear wider D) the A band to appear darker 50) Rigor mortis occurs because A) the eells are dead B) sodium ions leak into the muscle causing continued contractions C) no ATP is available to release attached actin and myosin molecules D) proteins are beginning to break down, thus preventing a flow of calcium ions 51) Which of these is NOT a way of classifying muscles? A) muscle location B) the type of muscle fibers C) the type of action they cause D) muscle shape 52) The oxygen-binding protein found in muscle cells is A) hemoglobin B) ATPC) myoglobin D) immunoglobin 53) The contractile units of skeletal muscles are A)microtubules B)mitochondria C)Ttubules D)myofibrils 54) Which of the following muscles is NOT a member of the hamstrings group? A) vastus intermedius B) semitendinosus C) semimembranosus D) biceps femoris 55) Tennis players often complain about pain in the arm (forearm) that swings the racquet. What muscle is usually strained under these conditions? A) the triceps brachii B) the anconeus C) the brachioradialis D) the flexor digitorum profundus 56) If given the exact same amount of ATP, which of the three fiber types would be able to contract for the longest amount of time? A) fast glycolytic fibers B) slow oxidative fibers C) both fast glycolytic and fast oxidative fibers D) fast oxidative fibersExplanation / Answer
45. C .Produce movement through contractile force.
Reason : myofibrils are responsible for muscular movement with the help of thick and thin filaments.
46. A . Antagonist.
Reason: muscle that opposes the action of another muscle is called antagonist muscle.
47. B. Actin filaments.
Reason: During muscle contraction the myosin head binds to myosin binding site of actin filaments and produce power stroke.
48.A . Weakness of muscle.
Reason : muscle weakness, double vision, difficulty with speech , chewing and breathing are some of the symptoms of myasthia gravis.
49.A The I bands to appear smaller.
Reason: during muscle contraction I -band and H-zone become short . so that I -band appears smaller.
50.C no ATP is available to release attached actin and myosin molecules.
Reason: After death,Rigor mortosis occurs due to the lack of ATP to release actin and myosin.
51.B .The type of muscle fibers.
Reason: most of the muscles contain mixture of each type of muscle fibers.
52.C Myoglobin.
Reason: myoglobin is the iron containing and Oxygen binding protein present in muscle tissue.
53. D .myofibrils.
Reason: Myofibrils or muscle fibers are the smallest contractile units of skeletal muscles.
54.A vastus intermedius
Reason: Hamstring group is made of semitendinosus , semimembranosus, biceps femoris and gracilis.
55.C the Brachioradialis.
Reason: Brachioradialis is the muscle present in fore arm , which is useful for movement of fore arm for playing tennis.
56. B slow oxidative fibers
Reason: slow oxidative fibers contract slowly than the remaining muscle fibres .So that they can contract for longest period of time.
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