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Author Question: Which molecule prevents a muscle contraction from occurring when the muscle is at rest? a. ... (Read 93 times)

nelaaney

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on: Jun 25, 2018
Which molecule prevents a muscle contraction from occurring when the muscle is at rest?
 
  a. Calcium
  b. Troponin-tropomyosin
  c. Actin
  d. Myosin

Question 2

Which characteristic of a postural muscle is a result of having substantial amounts of type I mus-cle fibers?
 
  a. Resists fatigue
  b. Rapid response time
  c. Little contractibility
  d. Lacks a fascia lining


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wilsonbho

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

ANS: B
Contraction begins as the calcium ions combine with troponin, a reaction that overcomes the in-hibitory function of the troponin-tropomyosin system. Calcium, actin, and myosin all facilitate muscle contraction.

Answer to Question 2

ANS: A
Postural muscles have more type I fibers, allowing them the high resistance to fatigue that is nec-essary to maintain the same position for extended periods. The ocular muscles have more type II muscle fibers, allowing them to respond rapidly to visual changes.
Little contractibility or lacking a fascia lining is associated with type I muscle fibers.


nelaaney

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Reply 2 on: Jun 25, 2018
Gracias!

patma1981

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Reply 3 on: Yesterday
Excellent

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