The mitochondria of a spermatozoon are concentrated in the
Correct answer: C. middle piece
- A. head
- B. acrosome
- C. middle piece
- D. tip of the tail
Explanation
A spiral sheath of mitochondria wraps the middle piece and supplies the ATP that the flagellum needs for the long journey to the oviduct. Placing them immediately behind the head puts the energy source next to the machinery that uses it. Almost none of these mitochondria enter the egg at fertilisation, which is why human mitochondrial DNA is inherited from the mother alone.
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About Human Reproductive System
The human reproductive system includes the male and female organs that produce gametes, secrete sex hormones and support fertilization and development. Questions cover the testes, ovaries, reproductive ducts, menstrual and ovarian cycles, ovulation, fertilization, implantation, placenta formation and the roles of FSH, LH, oestrogen, progesterone and testosterone.
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