1. Prenatal Development (Conception to Birth)
* Fertilization: A sperm cell fertilizes an egg cell, creating a zygote.
* Embryonic Stage (Weeks 1-8): The zygote rapidly divides, forming a blastocyst, which implants in the uterine wall. Major organ systems begin to form.
* Fetal Stage (Weeks 9-40): The embryo is now called a fetus, and continues to grow and develop, with organs becoming functional.
2. Infancy (Birth to 1 year)
* Neonatal Period (Birth to 4 weeks): Rapid physical and physiological adjustments to life outside the womb.
* Infancy (4 weeks to 1 year): Rapid growth and development of motor skills, language, and social interaction.
3. Childhood (1 year to puberty)
* Early Childhood (1 to 6 years): Continued physical, cognitive, and social development.
* Middle Childhood (6 to 12 years): Focus on academic learning, peer relationships, and increased independence.
4. Adolescence (Puberty to 18-21 years)
* Puberty: Hormonal changes lead to sexual maturation and physical development (e.g., growth spurts, development of secondary sex characteristics).
* Late Adolescence: Transition to adulthood, often marked by exploration of identity, career paths, and relationships.
5. Adulthood (18-21 years to death)
* Early Adulthood (18-21 to 40 years): Peak physical health, often marked by career development, relationships, and family formation.
* Middle Adulthood (40 to 65 years): Continued development, but with potential for physical decline.
* Late Adulthood (65 years to death): Physical and cognitive decline become more noticeable, but there is great variation in individual health and functioning.
6. Death
* The final stage of the life cycle, marked by the cessation of all bodily functions.
Important Note:
The stages of the human life cycle can vary in their duration and characteristics based on individual differences, cultural factors, and environmental influences.
