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Home Q & A Board Biology-Related Homework Help General Biology
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becca29 becca29
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6 years ago
Muscle contraction does not shorten the muscle filaments (myosin and actin). How then, does a contraction produce tension?
 
  What will be an ideal response?

Question 2

Four of the five answers listed below are related by the number of chromosome sets present. Select the exception.
 
  a. spores
  b. sporophyte
  c. egg
  d. sperm
  e. gametophyte
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#1
6 years ago
Answer to q. 1

Neither actin nor myosin filaments change length, but their relative positions change. Myosin filaments do not change position but myosin heads bind to actin filaments and slide them toward the center of a sarcomere (the contractile unit of a muscle). As the actin filaments are pulled inward, the ends of the sarcomere are drawn closer together, and the sarcomere shortens. It is the shortening of the sarcomere that creates muscle tension.

Answer to q. 2

b
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