Human Reproduction: From Gametes to Fetus Development
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Sperm
- Midpiece: This is located between the head and the tail. It contains mitochondria at the base of the flagellum, which provide energy for movement. It also contains centrioles that control the sperm's movement.
- Tail: The flagellum is made of proteins and is the part that moves.
Egg
The egg contains the zona pellucida, vitelline membrane, deutoplasm, nucleus, and corona radiata. It carries 23 chromosomes. It is elongated, visible to the human eye, immobile, and has a reserve of nutrients.
Ovarian Cycle
After puberty, oogenesis takes place in women approximately every 28 days. One egg matures and is released. The ovarian cycle has three phases:
Follicular Phase
This phase lasts about 14 days and is caused by the follicle-stimulating hormone produced