Four chambers of the human heart

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Of the four chambers of the human heart, which has the thickest walls, and why?

Why can you not catch the same cold twice, but a new cold will make you sick for a week or two?

  1. What is the key step in spermatogenesis that allows for unlimited sperm production? This step is not present in oogenesis, and therefore only a finite number of eggs could be produced.

Reference no: EM131334125

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