In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Q: Question: Nuclear power plants produce electricity through what? Answer: induced fission

A: Nuclear power plants produce electricity through induced fission.
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Q: Question: What are the sporophytes in ferns? Answer: leafy plants

A: Leafy plants are the sporophytes in ferns.
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Q: Question: What kind of muscle cells undergo twitch-type contractions with long refractory periods followed by brief relaxation periods, allowing the heart to fill with blood for the next cycle? Answer: cardiac muscle

A:
Cardiac muscle kind of muscle cells undergo twitch-type contractions with long refractory periods followed by brief relaxation periods, allowing the heart to fill with blood for the next cycle.
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