L5 Muscular System Chapter 9

L5 Muscular System Chapter 9 - Muscular System: Chapter 9...

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Muscular System: Chapter 9 1. When describing muscle, what does “striated” mean? Striated means “with stripes.” 2. Harry was pondering an exam question that said, “What muscle type has elongated cells and is found in the walls of the urinary bladder?” What should he have responded? He should have responded “smooth muscle,” which fits the description. 3. How does the term epimysium relate to the role and position of this connective tissue sheath? “Epimysium” literally translates to “outside the muscle” and this connective tissue sheath is the outermost muscle sheath which encloses the entire muscle. 4. Which myofilaments have binding sites for calcium? What specific molecule binds calcium? The thin myofilaments have binding sites for calcium on the troponin molecules forming part of those filaments. 5. Which structure-T tubule, mitochondrion, or SR-contains the highest concentration of calcium ions in a resting muscle fiber? Which structure provides the ATP needed for muscle activity? In a resting muscle fiber, the SR would have the highest concentration of calcium ions. The mitochondrion provides the ATP needed for muscle activity. 6. What are the three structural components of a neuromuscular junction? The components of the neuromuscular junction are the axon terminal, the synaptic cleft, and the junctional folds of the sarcolemma. 7. What is the final trigger for contraction? What is the initial trigger? The final trigger for contraction is a certain concentration of calcium ions in the cytosol.
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This note was uploaded on 10/28/2011 for the course BIO 212 taught by Professor Klesath during the Spring '09 term at N.C. State.

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L5 Muscular System Chapter 9 - Muscular System: Chapter 9...

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