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Prentice Hall Science Explore Human Biology and Health

endocrine gland

A structure of the endocrine system which produces and releases its chemical products directly into the bloodstream.


the chemical product of an endocrine gland

target cell

A cell in the body that recognizes a hormone's chemical structure.


a part of the brain that links the nervous system and the endocrine system

pituitary gland

An endocrine gland that controls many body activities

negative feedback

A process in which the endocrine system is turned off by the condition it produces


Female sex cell


Male sex cell


the joining of a sperm cell and an egg cell


a fertilized egg, produced by the joining of a sperm and an egg


male reproductive organ that produces sperm and testosterone


A hormone produced by the testes that controls the development of physical characteristics in mature men


the external pouch that contains the testes


a mixture of sperm and fluids


the organ through which both semen and urine leave the male body


organ of the female reproductive system in which eggs and estrogen are produced


a hormone produced by the ovaries that controls the development of eggs and adult female characteristics

fallopian tube

a passageway for eggs from an ovary to the uterus


the hollow muscular organ of the female reproductive system in which a fertilized egg develops


a muscular passageway leading to the outside of the body; also called the birth canal

menstrual cycle

the cycle of changes that occurs in the female reproductive system, during which an egg develops and the uterus prepares for the arrival of a fertilized egg


The process by which a mature egg is released from the ovaries into the fallopian tubes.


Process in which the thickend lining of the uterus breaks down and blood and tissue exit the female body through the vagina.


A developing human during the first eight weeks after fertilization has occurred.


a developing human from the ninth week of development until birth

amniotic sac

a fluid-filled sac that cushions and protects a developing embryo and fetus in the uterus


a membrane that becomes the link between the developing embryo or fetus and the mother

umbilical cord

a ropelike structure that forms between the embryo or fetus and the placenta


the stage of development between childhood and adulthood when children become adults physically and mentally


the period of sexual development in which the body becomes able to reproduce

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