Answer:
A sperm cell is the male reproductive sex cell. Sperm cells of different animal species have different shapes and structures. In humans it consists of two major parts, the head and the tail. The head is flat and almond-shaped. The head contains the nucleus which carries genetic substances called chromosomes. One sperm cell contains half the number of chromosomes the species has. Humans have 46 chromosomes so each sperm cell has 23. The sperm cells also carry the X or Y chromosome that determines the sex of the future child.
The tail of the sperm, sometimes called the flagellum, is a slender, hairlike bundle of filaments that connects to the head. It whips and undulates so that the cell can travel to the egg. Following sperm deposition in the female reproductive tract, activation of tail movement is suppressed until the sperm is carried to within a relatively short distance of the egg. This gives the sperm an increased chance of reaching the egg before exhausting its energy supplies.