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Author Question: Muscle contractions occur when there is a decreased: a. distance between Z lines. b. A band ... (Read 92 times)

sheilaspns

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on: Jun 25, 2018
Muscle contractions occur when there is a decreased:
 
  a. distance between Z lines.
  b. A band length.
  c. Z line length.
  d. H zone distance.

Question 2

The molecule that aids in bonding of the troponin complex to actin and tropomyosin is troponin:
 
  a. C.
  b. I.
  c. T.
  d. M.


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kingdude89

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Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: A
Anatomically, contraction occurs when the sarcomere shortens, so adjacent Z lines move closer together. Such a contraction does not occur in relationship to a decrease in A band or Z line length or a decrease in H zone distance.

Answer to Question 2

ANS: C
Troponin T aids in the binding of the troponin complex to actin and tropomyosin. Troponin C contains binding sites for the calcium ions involved in contraction. Troponin I inhibits the ATPase of actomyosin. Troponin M is not a substance.


sheilaspns

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Reply 2 on: Jun 25, 2018
Thanks for the timely response, appreciate it

shailee

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Reply 3 on: Yesterday
Excellent

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