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edugen.wileyplus.com STUDYBLUE Find and share online flashcards and notes trom StudyBlue. Any 1-Which Ot The Following Medially Rotates The Hip?... Chegg.com Return to Blackboard WileyPLUS Tortora, Principles of Human Anatomy, 14e Assignment Open Assignment PRINTER VERSION BACK NEXT ASSIGNMENT RESOURCES Question 1 In the figure shown, which is FALSE concerning the sliding filament mechanism? and 11) Question 4 l Question l Question 2 (a) Relaxed musclee Question 15 (b) Partially contracted muscle zl Question 21 Question 26 Version 4.24.1.23

Explanation / Answer

The False statement is Option E. A band decreases in length

During muscle contraction, the length of A band remains constant.

First option: Correct. Thin filaments, also known as actin filaments are the ones that "moves" during muscle contraction and these filaments (which is represented as I band) move over the A band (which contains myosin filaments)

Second option: Correct Actin is linked to structures located at the lateral ends of each sarcomere called z discs and hence when the actin contracts inward, the Z discs comes closer

Third option: Correct Sarcomere consists of the I, A and H bands. So when the I band (Actin band) and H zone shortens, it is actually the sarcomere that shortens

Fourth Option: Correct. The H-zone is the area of the thick filaments that is not superimposed by the thin filaments, but when contraction happens, actin comes inward and the H zone starts to decrease in length.

Fifth Option: False. Studies have shown that one zone of the sarcomere arrangement, the "A band," remained relatively constant in length during contraction and the A band contains thick filaments of myosin, which suggested that the myosin filaments remained central and constant in length while other regions of the sarcomere shortened.

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