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.

Question: What kind of reaction adds water to an organic molecule and breaks the large molecule into smaller molecules? Answer: hydration reaction
Hydration reaction kind of reaction adds water to an organic molecule and breaks the large molecule into smaller molecules.

Question: Acting like drawstrings to close off the alimentary canal, what regulates the passage of material between compartments? Answer: sphincter
Acting like drawstrings to close off the alimentary canal, the sphincter regulates the passage of material between compartments.

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
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.