1. A cell in the body that recognizes a hormone’s chemical structure
Endocrine System
The body’s system of glands that produce and release chemical products directly into the bloodstream
Hormone
A chemical in an organism that produces a specific effect such as growth or development
Target Cell
A cell in the body that recognizes a hormone’s chemical structure
Hypothalamus
A part of the brain that links the nervous system and the endocrine system
Pituitary Gland
Controls many body functions, including growth, blood pressure and water balance

2. Thyroid Gland Pancreas Thymus Gland Testes Ovaries
Controls the release of energy from food
Pancreas
Produces insulin which controls the level of glucose in the body
Thymus Gland
Helps develop the immune system in early childhood
Testes
Controls the changes in a male’s body during puberty
Ovaries
Controls the changes in a female’s body during puberty

3. Adrenal Gland Negative Feedback Zygote Embryo Fetus
Triggers the body’s response to emergency situations
Negative Feedback
A process in which a system is turned off by the condition it produces
Zygote
A fertilized egg
Embryo
A developing human during the first eight weeks after fertilization
Fetus
A developing human from the ninth week of development until birth

4. Amniotic Sac Placenta Umbilical Cord Adolescence Puberty
A fluid filled sac that cushions and protects a developing embryo and fetus in the uterus
Placenta
A membrane that becomes the link between the developing embryo or fetus and the mother
Umbilical Cord
A rope like structure that forms between the embryo or fetus and the placenta
Adolescence
The stage of development between childhood and adulthood where children become adults physically and mentally
Puberty
The period of sexual development in which the body becomes able to reproduce