At a Glance

Life on Earth Chapter 27 Human Reproduction and Development
At a Glance

Human Reproduction: The male reproductive tract includes the testes and accessory structures.
The female reproductive tract includes ovaries and accessory structures.
The menstrual cycle is controlled by complex hormonal interactions.
Copulation allows internal fertilization.
During pregnancy, the developing embryo grows within the uterus.

On Limiting Fertility
Permanent contraception can be achieved through sterilization.
There are three major approaches to temporary contraception.
Additional contraceptive methods are under development.

Human Development
During the first two months, rapid differentiation and growth occur.
The placenta secretes hormones and exchanges materials between mother and embryo.
Growth and development continue during the last seven months.
Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.; The female reproductive tract includes ovaries and accessory structures.
The menstrual cycle is controlled by complex hormonal interactions.
Copulation allows internal fertilization.
During pregnancy, the developing embryo grows within the uterus.

On Limiting Fertility
Permanent contraception can be achieved through sterilization.
There are three major approaches to temporary contraception.
Additional contraceptive methods are under development.

Human Development
During the first two months, rapid differentiation and growth occur.
The placenta secretes hormones and exchanges materials between mother and embryo.
Growth and development continue during the last seven months.
Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.; The menstrual cycle is controlled by complex hormonal interactions.
Copulation allows internal fertilization.
During pregnancy, the developing embryo grows within the uterus.

On Limiting Fertility
Permanent contraception can be achieved through sterilization.
There are three major approaches to temporary contraception.
Additional contraceptive methods are under development.

Human Development
During the first two months, rapid differentiation and growth occur.
The placenta secretes hormones and exchanges materials between mother and embryo.
Growth and development continue during the last seven months.
Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.; Copulation allows internal fertilization.
During pregnancy, the developing embryo grows within the uterus.

On Limiting Fertility
Permanent contraception can be achieved through sterilization.
There are three major approaches to temporary contraception.
Additional contraceptive methods are under development.

Human Development
During the first two months, rapid differentiation and growth occur.
The placenta secretes hormones and exchanges materials between mother and embryo.
Growth and development continue during the last seven months.
Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.; During pregnancy, the developing embryo grows within the uterus.

On Limiting Fertility
Permanent contraception can be achieved through sterilization.
There are three major approaches to temporary contraception.
Additional contraceptive methods are under development.

Human Development
During the first two months, rapid differentiation and growth occur.
The placenta secretes hormones and exchanges materials between mother and embryo.
Growth and development continue during the last seven months.
Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.
On Limiting Fertility: Permanent contraception can be achieved through sterilization.
There are three major approaches to temporary contraception.
Additional contraceptive methods are under development.

Human Development
During the first two months, rapid differentiation and growth occur.
The placenta secretes hormones and exchanges materials between mother and embryo.
Growth and development continue during the last seven months.
Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.; There are three major approaches to temporary contraception.
Additional contraceptive methods are under development.

Human Development
During the first two months, rapid differentiation and growth occur.
The placenta secretes hormones and exchanges materials between mother and embryo.
Growth and development continue during the last seven months.
Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.; Additional contraceptive methods are under development.

Human Development
During the first two months, rapid differentiation and growth occur.
The placenta secretes hormones and exchanges materials between mother and embryo.
Growth and development continue during the last seven months.
Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.
Human Development: During the first two months, rapid differentiation and growth occur.
The placenta secretes hormones and exchanges materials between mother and embryo.
Growth and development continue during the last seven months.
Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.; The placenta secretes hormones and exchanges materials between mother and embryo.
Growth and development continue during the last seven months.
Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.; Growth and development continue during the last seven months.
Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.; Milk secretion, or lactation, is stimulated by pregnancy.
Reproduction culminates in labor and delivery.; Reproduction culminates in labor and delivery.

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