For normal human fertility, at least 40 per cent of the ejaculated sperms must show vigorous motility. Which specific region of the human sperm and its densely packed constituent organelle directly provide the energy required for this vigorous motility?

Step-by-step solution

According to the criteria for normal human fertility, out of the total ejaculated sperms, at least 60 per cent must have normal shape and size, and at least 40 per cent of them must show vigorous motility. The energy required for this vigorous motility is produced by numerous mitochondria. These mitochondria are densely packed specifically in the middle piece of the spermatozoan. The tail facilitates the actual movement, but the energy is provided by the mitochondria in the middle piece. The acrosome contains hydro