ECU Bio 2140 Exam 3 with answers

ECU Bio 2140 Exam 3 with answers
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H zone - CORRECT ANSWERS ✔✔thick filaments only
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M line - CORRECT ANSWERS ✔✔bisects H zone and A
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band


Z disc - CORRECT ANSWERS ✔✔bisects I band
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A band - CORRECT ANSWERS ✔✔Dark band with thick
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filaments


I band - CORRECT ANSWERS ✔✔light band with thin
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filaments


Sacromere - CORRECT ANSWERS ✔✔region between two
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successive Z discs |\ |\




Myofilaments - CORRECT ANSWERS ✔✔actin and myosin |\ |\ |\ |\ |\ |\




alpha-actinin - CORRECT ANSWERS ✔✔protein that forms
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Z discs
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anchors thin filaments |\ |\

,connects adjacent myofibrils |\ |\




desmin - CORRECT ANSWERS ✔✔hold adjacent thick
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filaments together |\




Myomesin - CORRECT ANSWERS ✔✔fine protein strands |\ |\ |\ |\ |\ |\ |\



that form M line
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elastic filaments - CORRECT ANSWERS ✔✔composed of
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titin, runs fromz disc to myosin and on the m line, holds
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thick filaments in place, extensible, recoils
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Myosin - CORRECT ANSWERS ✔✔a protein that makes up
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the thick filaments and has 2 heads and a long tail
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tail-2 twisted heavy polypeptide chain
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heads-ends of heavy chains and 2 light polypeptide |\ |\ |\ |\ |\ |\ |\ |\



chains


Troponin - CORRECT ANSWERS ✔✔A protein of muscle
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that together with tropomyosin forms a regulatory protein
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complex controlling the interaction of actin and myosin
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and that when combined with calcium ions permits
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muscular contraction |\

, Tropomyosin - CORRECT ANSWERS ✔✔a protein involved |\ |\ |\ |\ |\ |\ |\



in muscle contraction. It is related to myosin and occurs
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together with troponin in the thin filaments of muscle
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tissue.


myosin binding site - CORRECT ANSWERS ✔✔Found on
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the actin molecule - can be blocked by tropomyosin.
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TnI - CORRECT ANSWERS ✔✔binds to actin
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TnT - CORRECT ANSWERS ✔✔binds to tropomyosin
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TnC - CORRECT ANSWERS ✔✔binds calcium
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sarcoplasmic reticulum - CORRECT ANSWERS |\ |\ |\ |\ |\



✔✔surrounds each myofibril, network of tubules |\ |\ |\ |\ |\




terminal cisternae - CORRECT ANSWERS ✔✔the junction
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between A band and I band where the ER gets thicker
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T tubules - CORRECT ANSWERS ✔✔formed when
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sarcolemma forms a tube that extends deep into the cell. |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



conduct nerve impulses deep inside muscle cells
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