Development of the human body

Development of the human body is the process of growth to maturity. The process begins with fertilization, where an egg released from the ovary of a female is penetrated by a sperm cell from a male. The resulting zygote develops through mitosis & cell differentiation, & the resulting embryo then implants in the uterus, where the embryo continues developing through a fetal stage until birth. Further growth and development supports after birth, and includes both physical and psychological development, influenced by genetic, hormonal, environmental and other factors. This keeps throughout life: through childhood and adolescence into adulthood.

Organ systems

Human organs and organ systems defining in a process call as organogenesis. This begins in the third week of embryonic development, when the gastrula forms three distinct germ layers, the ectoderm, mesoderm and endoderm. The ectoderm will eventually determining into the outer layer of skin and nervous system. The mesoderm will earn skeletal muscles, blood cells, the reproductive system, the urinary system, near of the circulatory system, and the connective tissue of the torso. The endoderm will develop into the epithelium of the respiratory and gastrointestinal tracts and several glands.