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Second sounds

second sound --> second heart sound

The second sound heard on auscultation of the heart; signifies the beginning of diastole and is due to closure of the semilunar valves.

Synonym: second sound.


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reproductive system

Sounds like homework? Think about what helps the brain signal to the reproductive system to undergo changes. That's two right there. And, while I can't be sure if your teacher has a specific answer in mind, you might add the ...

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