Question

4. Please match each of the following structures with its correct description (4 pts) Tropomyosin Titin Myosin Troponin Sarcoplasmic reticulum e. elastic filament that anchors the thick myofilaments to the Z-disc complex of T-Tubules a. main protein of the thick filament, head has two binding sites one binds actir b. long, filament protein covering the myosin-binding sites on each actin molecule c. main protein of the thin myofilament, each individual protein has a high affinity d. control protein on the thin filament attached to tropomyosin. When Ca" is bound proteins, the other binds and cleaves ATP of the thin filament binding site for myosin protein it changes shape- which removes the blockade Proteins t. extensive membranous network in a muscle cell that stores Ca until signaled to release it. Contains constitutively active Ca pumps-always on, always pumping -z-dise Triad g. main anchoring proteins of the sarcomere-all myofilaments anchor to this h. protein found in the exact middle of the sarcomere in the "M-line" that serves to complex of proteins help anchor thick myofilaments Extensive invaginations of the sarcolemma, closely associated with the terminal cisternae of the SR-plays a key role in the release of Ca consists of T-tubules and terminal cisternae of the SR, region where Cat+ is released when wave of depolarization is present j.

Answer 1

Answer

1. Tropomyosin ---------- b. long filament proteiin covering the myosin -binding sites on each actin molecule on the thin filament
   
2. Ttin ------------ e. Elastic filament that anxhors the thick myofilaments to Z disc complex of proteins
   
3. Myosin --------- a. Main protein of thick filament, head has two binding sites -------one binds with actin, other cleaves ATP
   
4. Troponin --------- d. Control protein of thin filament attached to tropomyosin. When Ca is bound it changes its shape - removes blockade.
   
5. Sarcoplasmic reticulum --------- f. Extensive membraneous network in muscle cell that stores calcium until signalled to release it. Contains consecutively arranges Ca pumps- always on and pumping
   
6. T-Tubules -------- i. Extensive invaginations of sarcolemma , closely associated with the terminal cisternae of the SR --- play key role in release of Ca.
   
7. Z-disc --------- c. main portein of thin myofilament, each individual protein has high affinity site for binding site of myosin protein
   
8. Triad -------- j. consists T tubules and terminal cisternae or the SR, region where Ca is releases when wave depolarization is present