(answered) – 1 of 50 Which of the following describes voluntary muscle tissue?DescriptionSolution downloadThe Question1 ?of?50Which of the following describes voluntary muscle tissue?Smooth muscleCardiac muscleSkeletal muscleDense irregularDense regularQuestion2 ?of?50What does endomysium cover?Smooth muscle onlyFascicles of muscle cellsAn entire muscleAn individual muscle cellMyofibrilsQuestion3 ?of?50What is the name of the plasma membrane of a skeletal muscle cell?SarcoplasmMyofilamentSarcomereSarcoplasmic reticulumSarcolemmaQuestion4 ?of?50Which of the following describes a sarcomere?The contractile unit between two Z discsThe area between two intercalated discsThe wavy lines on the cell, as seen in a microscopeThe nonfunctional unit of skeletal muscleA compartment in a myofilamentQuestion5 ?of?50Which of the following lists the structures of the skeletal muscle in order from largest to smallest?Fascicle Myofilament Muscle fiber (cell) MyofibrilSarcomere3, 2, 5, 4, 11, 3, 4, 5, 22, 5, 4, 3, 13, 1, 2, 4, 51, 4, 3, 2, 5Question6 ?of?50What is acetylcholine?A source of energy for muscle contractionA component of thick myofilamentsAn oxygen-binding proteinA neurotransmitter that stimulates skeletal muscleAn ion pump on the postsynaptic membraneQuestion7 ?of?50What is the name of the gap between the axon terminal of a motor neuron and the sarcolemma of a skeletal muscle cell?Cross bridgeSarcomereSynaptic cleftNeuromuscular junctionMotor unitQuestion8 ?of?50Why are calcium ions necessary for skeletal muscle contraction?Calcium increases the action potential transmitted along the sarcolemma.Calcium initiates the depolarization of the sarcolemma.Calcium triggers the binding of myosin to actin.Calcium makes the membrane more permeable to sodium ions.Calcium causes ATP binding to actin.Question9 ?of?50What generates the mechanical force of contraction?The “accordion-like” folding of thin and thick filamentsThe temporary disappearance of thin filamentsThe shortening of the thin filamentsThe sliding of thin filaments past thick onesThe shortening of the thick filamentsQuestion10 ?of?50What does a motor unit include?Muscle fibers onlyMotor neurons onlySeveral motor neurons and one muscle fiberSeveral muscle fibers and one motor neuronOne muscle fiber and one nerveQuestion11 ?of?50Which of the following describes when a muscle contracts so completely that no relaxation is seen while the contraction is sustained?TetanusIncomplete tetanusTwitchA normal contractionSummationQuestion12 ?of?50How can the condition of skeletal muscle fatigue best be explained?The inability to generate sufficient quantities of ATP due to feedback regulation of synthesisInsufficient intracellular quantities of ATP due to excessive consumption of oxygenThe all-or-none lawThe total lack of ATPInadequate numbers of mitochondriaQuestion13 ?of?50Anaerobic glycolysis occurs when which substance is lacking?GlucoseOxygenATPLactic acidCarbon dioxideQuestion14 ?of?50What do isometric contractions produce?Contractions and shortening, but not movementMovementContractionsContractions and movement, but not shorteningMuscle shorteningQuestion15 ?of?50What is the name of the movement that decreases the angle between two bones?AbductionFlexionCircumductionExtensionRotationQuestion16 ?of?50While doing “jumping jacks” during an exercise class, the arms and legs move laterally away from the midline of the body. What is this motion called?AdductionExtensionAbductionCircumd
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