Muscle types do differ in their anatomies weve learned onlyabout the ...

Muscle types do differ in their anatomies; weâ€™ve learned only about the most common types. Mark...

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Muscle types do differ in their anatomies; weâ€™ve learned onlyabout the most common types. Mark each of the followingA if theyâ€™d always co-occur; Siftheyâ€™d sometimes co-occur, or Nif theyâ€™d neverco-occur in the same muscle type. (Hint: Base your answers onif one of the items is functional in the absence of theother.)
A.Â Â Â Â Â Â Â Â t-tubules andsarcoplasmic reticulum
B.Â Â Â Â Â Â Â Â motor units andtroponin

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4.4 Ratings (740 Votes)

A. T- tubules and sarcoplasmic reticulum - A

They both always occur together in cardiac and skeletal muscles. T tubules conduct impulses from the surface of the cells to sarcoplasmic reticulum which stores calcium.

B. Motor units and troponin - S

They occur together in skeletal muscle but not in cardiac muscle of which troponin is a part.

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