During contraction of skeletal muscle fibers, the
a. contractile proteins shorten
b. thin filaments slide inward toward the A band's center as a result of cycles of cross-bridge binding and bending
c. thick and thin filaments become tightly coiled, thus shortening the sarcomere
d. I bands slide in between the A bands
e. lateral sacs of the sarcoplasmic reticulum shorten, pulling the Z lines closer together
B
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Helper T cells secrete T-cell __________, which augments the activity of __________ T cells
Fill in the blank(s) with correct word
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