topes of museles is striatend and contains gop junctions? R Skeletal muscle C. C
ID: 133304 • Letter: T
Question
topes of museles is striatend and contains gop junctions? R Skeletal muscle C. Cardiac mascle D. Areolar muscle E None of the above 22 Which of the following is the first to occur in response to electrical stimulation of a muscle fiber A Movement of tropomyosin B. Attachment of the cross-bridges to actin C Release of calcium ions from sarcoplasmic reticulum D. Splitting of ATP 23. The role of tropomyosin in striated muscle contraction is to A. Actively transport calcium ions into the sarcoplasmic reticulum B. Bind the calcium ions that initiate cross bridge activity C. Block the binding sites on actin to which the myosin cross bridges bind D. Break down creatine phosphate to provide the energy for ATP synthes E. None of the above 24. Anacrobic respiration occurs mostly in A. Intermediate muscle fibers B. Red muscle fibers C. White muscle fiber D. Cardiac muscle fiber E. None of the above 25. The action potentials spreads through the skeletal muscle fiber through the A. Terminal cisternae C. Transverse tubules (T-tubules) D. Sarcoplasmic reticulum E. Perimysium 26. Which of the following statements is TRUE about contraction of smooth muscles? A. Calcium binds to Troponin B. Activatod myosin light chain kinase causes cross-bridge activation and contraction C. Calcium is not required for contraction of smooth muscles D. ATP is required for the detachment of the myosin heads from Actin E. None of the above statements are true 27. The synapse between a skeletal muscle cell membrane and a somatic motor neuron is called A. Axodendritic synapse B. Electrical synapse C. Neuromuscular junction D. Sarconeural synapse E. Dendrodendritic synapseExplanation / Answer
Smooth muscle has gap junctions but it isn’t striated. Skeletal muscle doesn’t have any cell-cell junctions. The areolar tissue is formed by smooth muscle so it isn’t the answer neither.
Cardiac muscle contains gap junctions which provide direct contact between the cardiac cells, facilitating electrical communication. It is also a striated muscle so the answer is clearly C.
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