In this Grade 7 Life Science lesson from Chapter 20, students explore the male and female reproductive systems, learning how specialized cells — sperm and egg cells — provide genetic material for reproduction. The lesson covers key processes including menstruation, fertilization, and the development of an embryo and fetus during pregnancy. Students also examine how hormones from the endocrine system regulate sexual development and the function of reproductive organs such as the ovaries, fallopian tubes, uterus, and testes.
Section 1
Reproductive Systems Create Specialized Cells
Males produce sperm cells while females produce egg cells. Each specialized cell contains half the genetic material needed for human development. Hormones from the endocrine system trigger sexual development and maintain secondary characteristics.
Section 2
Sperm and Egg Unite During Fertilization
During fertilization, one sperm cell joins with one egg cell in the fallopian tube. Their genetic material combines, creating an embryo that divides repeatedly and eventually implants in the uterus.
Section 3
Embryos Develop Into Fully Formed Fetuses
After eight weeks, the embryo becomes a fetus with facial features and major organ systems. The placenta and umbilical cord deliver nutrients from the mother as the fetus continues developing for nine months.
Section 4
Female Bodies Cycle Through Menstruation
Every 28 days, hormones trigger an egg's release from the ovary. If fertilization doesn't occur within 24 hours, the uterine lining breaks down, resulting in menstruation—the five-day flow of blood and tissue.
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Section 1
Reproductive Systems Create Specialized Cells
Males produce sperm cells while females produce egg cells. Each specialized cell contains half the genetic material needed for human development. Hormones from the endocrine system trigger sexual development and maintain secondary characteristics.
Section 2
Sperm and Egg Unite During Fertilization
During fertilization, one sperm cell joins with one egg cell in the fallopian tube. Their genetic material combines, creating an embryo that divides repeatedly and eventually implants in the uterus.
Section 3
Embryos Develop Into Fully Formed Fetuses
After eight weeks, the embryo becomes a fetus with facial features and major organ systems. The placenta and umbilical cord deliver nutrients from the mother as the fetus continues developing for nine months.
Section 4
Female Bodies Cycle Through Menstruation
Every 28 days, hormones trigger an egg's release from the ovary. If fertilization doesn't occur within 24 hours, the uterine lining breaks down, resulting in menstruation—the five-day flow of blood and tissue.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter