muscles
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| Functions of muscles are for | A.the heartbeat.B.muscle tone.C.distribution of heat.D.moving bones.
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| The outermost layer of connective tissue surrounding a skeletal muscle is the | Epimysium.
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| Myofibrils are composed primarily of | actin and myosin.
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| The striated appearance of skeletal muscle results from the | sarcomere organization.
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| Transverse tubules | transmit muscle impulses into the cell interior.
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| The discoloration and swelling of a muscle strain is due to | ruptured blood vessels.
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| A tendon is ______, whereas an aponeurosis is ______. | cordlike and connects muscles to bones; a broad, fibrous sheet of connective tissue that connects muscles to muscles
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| Muscle fibers are basically a collection of | sarcomeres
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| Transverse tubules and sarcoplasmic reticulum are well developed in fibers | skeletal muscle fibers
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| The functional unit of muscle contraction is | the sacomere
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| Neurotransmitters are stored in vesicles in | motor neuron endings
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| The enzyme acetylecholinesterase causes acetylcholine to | decompose
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| creatine phosphate | supplies energy for the synthesis of ATP.
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| The amount of oxygen liver cells require to react lactic acid to produce glucose or the glycogen glycogen is the | oxygen dept
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| Tawanda finishes a sprint and suffers great pain in her calf muscles. Her muscle cramps are most likely dueto a temporary deficit of | ATP
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| Athletes usually experience muscle fatigue less quickly than nonathletes because they | .produce less lactic acid.
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| At a neuromuscular junction the muscle fiber membrane folds forming a | motor end plate
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| The toxin that causes botulism | prevents release of acetylcholine.
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| Rigor mortis affects skeletal muscles a few hours after death due to | decreased ATP and increased permeability to calcium.
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| At a neuromuscular junction | .neurotransmitters are released.
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| The first event in muscle fiber contraction is that. | acetylcholine is released from the end of the motor neuron.
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| Which of the following statements is correct? | Actin filaments slide along myosin filaments.
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| The functional connection between a neuron and a skeletal muscle fiber is | synapse
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| __________ degrades acetylcholine keeping it from accumulating in the synapse. | Acetylcholinesterase
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| A shift in metabolism that breaks down pyruvic acid to lactic acid is called | anaerobic threshold.
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| Oxygen debt in muscles may develop because of | the inability of respiratory and circulatory systems to supply enough oxygen to skeletal muscles when used strenuously for a minute or two.
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| The relationship between ATP and creatine phosphate is that | creatine phosphate supplies energy to regenerate ATP from ADP and phosphate.
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| A motor unit is | a motor neuron and the muscle fibers connected to it.
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| during muscle contraction ATP supplies energy for | myofilament movement.
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| Skeletal muscles help maintain body temperature in that | .the more active they are the more heat is released.
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| Threshold stimulus is the | minimal amount of energy required to contract a muscle fiber
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| A myogram is | a recording of the events of a twitch.
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| An example of a partial but sustained contraction is | muscle tone
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| Which of the following is not true | Red fibers have fewer mitochondria than white.
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| in a recording of a muscle twitch the delay between the time a stimulus is applied and the time the muscleresponds is called the | latent period
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| The very brief moment following stimulation when a muscle remains unresponsive to additional stimulationis called the | refractory period
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| Smooth muscle lacks | transverse tubules and striations.
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| Smooth muscle has ___________ and not troponin. | calmodulin
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| Compared to skeletal muscle smooth muscle | contracts more slowly and relaxes more slowly.
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| The type of muscle cell that lacks transverse tubules has a single nucleus and is under involuntary control is | smooth muscle
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| Short muscle cells with centrally located nuclei are | smooth muscle fibers
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| Both acetylcholine and norepinephrine can affect | smooth muscle contraction
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| The structures that connect cardiac muscle cells are. | intercalated disc
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| Cardiac muscle | A.contracts as a syncytium.B.excites itself. C.responds in an all-or-none manner D.is only in the heart.
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| Bones and muscles function as mechanical devices called | levers
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| The movable end of a muscle is its | insertion
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| The muscle primarily responsible for an action is the | prime mover
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| A muscle that assists a prime mover is a(n) | synergist
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| The buccinator muscle is in the | cheek
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| The muscle that adducts and flexes the arm is the | coracobrachialis.
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| The linea alba is | a band of tough connective tissue to which abdominal wall muscles attach.
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| The soleus is a muscle that forms part of the | calf
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| Which of the following is not a muscle of mastication? | mandibular
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| Which of the following is unique in that its insertion is to fascia and not bone? | palmaris longus.
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| The triangle of auscultation commonly used to hear sounds of respiratory organs is located near the border of the | trapezius and latissimus dorsi.
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| A gluteal gait in which a person walks with a waddling limp is usually caused by a disorder of the | gluteus medius and gluteus minimus.
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| A sign of aging of the muscular system is | decreased supplies of myoglobin to muscles.
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| Muscle atrophy that progresses with aging is caused by reduction in | A.ATP.B.myoglobin.C.the sizes of muscle fibers.D.creatine phosphate.
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| People with myasthenia gravis lack | about two-thirds of the normal number of acetylcholine receptors
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| Myasthenia gravis is | an autoimmune disorder
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| Weightlifting in which a muscle exerts more than 75% of its maximum tension stimulates | muscle fibers developing new filaments of actin and myosin
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| Fibers of muscles whose motor neurons are severed. | may be replaced by fat or fibrous connective tissue.
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| Temporomandibular joint (TMJ) syndrome cause | A.insomnia.B.ringing in the ears.C. backache.D.clicking sound from the jaw.
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| Binding sites on the surface of actin allow the formation of cross-bridges with molecules of | myosin
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| the characteristic reddish brown color of skeletal muscle comes from this substance | myoglobin
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| Activities such as distance swimming and distance running are most likely to stimulate development of | slow, fatigued, resistant muscle fibers
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| the increase in the number of motor units activated are a result of more intense stimulation | recruitment
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Created by:
lula78