Human Reproduction

Reproduction is a process that results in the formation of new individuals of the same kind, though usually with slight genetic, structural and physiological variations.

Humans are sexually reproducing and viviparous (give birth to live young) organisms. Every organ system in the human body works to maintain homeostasis for the survival of the individual. The human reproductive system, however, is essential for the survival of the species. An individual may live a long and healthy life without producing offspring, but reproduction is inevitable for the existence of a species.

Four Main Functions of the Reproductive System:

Primary vs. Accessory Reproductive Parts:

The organs of the reproductive system are divided into two categories:

1. Primary Reproductive Parts (Gonads)
   Include the gonads - testes in males and ovaries in females - which produce the sex cells (gametes): sperms and eggs. They also secrete sex hormones.
2. Accessory Reproductive Parts
   Include all structures, ducts, and glands that help in the transfer and meeting of the two kinds of sex cells, leading to fertilisation, and in the growth and development of the egg up to the birth of the baby.

• Humans are sexually reproducing and viviparous (give birth to young ones, not eggs).
• 6 stages of reproduction in order: Gametogenesis → Insemination → Fertilisation → Implantation → Gestation → Parturition.
• Gametogenesis (gamete formation), Insemination (sperm transfer), Fertilisation (fusion → zygote), Implantation (blastocyst attaches to uterine wall), Gestation (embryo development), Parturition (delivery of baby).
• Sperm formation continues throughout a man's life; ovum formation ceases at around age fifty (menopause) in women.
• Testes (males) produce sperm; Ovaries (females) produce eggs; these are the primary reproductive organs (gonads).
• Features like beard (males) and breasts (females) are secondary sexual characters; they do not directly participate in reproduction.