18. - Approach that best describes a sarcomere: A. A repeating series of dark an

Question

18. - Approach that best describes a sarcomere: A. A repeating series of dark and light bands, they are evident along the length of each myofibril. B. Bundle of muscle cells surrounded by perimysium C. It is similar of the cytoplasm of other cells but it contain unusually large amounts of glycosomes and myoglobin D. The region of the myofibrils between the two successive Z discs. it is the functional unit of skeletal muscle E. It is a long cylindrical cell with multiple oval nuclei just beneath its sarcolemma or plasma membrane. 19. -Incorrect approach about the degree of muscular response A. Increase frequency of muscle stimulation increase muscle response B. Increase # muscle cells,being stimulated increase muscle res C. Decrease # muscle cells-being stimulated increase muscle response D. Decrease # muscle cells,being stimulated decrease E. Decrease frequency of muscle stimulation Decrease muscle res muscle response ponse 20. -One of the events does not correspond to the contraction of the sarcomere te slide nast thick ones so they overlap more

Explanation / Answer

Ans 18)

D) The region of the myofibrils between two successive Z discs. It is the functional unit of skeletal muscle. The myofibrils form the repeating units between two Z lines. The two important types of proteins are myosin and actin with their respective roles which includes formation of thick filament and formation of thin filament. The actin molecules are bond to the Z line and it borders the sarcomere. It gives striated appearance to the skeletal as well as the cardiac muscle.

Ans 19)

B) Increase muscle cells being stimulated increase muscle response. As the muscle cells are stimulated to increase in size, it grows in size due to the tension created. This leads to overall increase in the muscular response.

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