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4 years ago

6

A muscle cell contracts or expands when _____. A. actin and myosin filaments slide over each other B. axons transmit signals to

chloroplasts C. xylem and phloem open and close D. cilia project outward from the cytoplasm

1 answer:

Rudik [331]4 years ago

4 0

Answer:

I'd say the answer is A.) actin and myosin filaments slide over each other

Explanation:

It's called the "sliding filament theory'

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