Ch.20 The Endocrine System & Reproduction Section 3: The Human Life Cycle

Section 3 Development Before Birth – The zygote develops first into an embryo and then into a fetus – Zygote & Embryo – Fetus – At what point during development can a heartbeat be detected in a fetus?

Section 3 Protection & Nourishment – The membranes and other structures that form during development protect and nourish the developing embryo, and later the fetus – Amniotic Sac – Placenta – Umbilical Cord – How does a fetus obtain oxygen?

Section 3 Birth – The birth of a baby takes place in three stages: labor, delivery, and afterbirth – Labor – Delivery

Section 3 Birth – Afterbirth – Birth & the Baby – Multiple Births – What are the two types of twins?

Section 3 Growth & Development – The changes that take place between infancy and adulthood include physical changes, such as an increase in size and coordination to communicate and solve complex problems – Infancy – Childhood

Section 3 Growth & Development – Adolescence Puberty – Adulthood