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Human Body Systems Ch 8
Interactive Science Series
31
Science
8th Grade
10/24/2017

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Cards

Term
gland
Definition
an organ that produces or releases a chemical
Term
ducts
Definition
tiny tubes that chemicals are released into
Term
hormone
Definition
the chemical produced by an endocrine gland
Term
target cells
Definition
cells that are specialized in a way that enables them to recognize a hormone's chemical structure
Term
hypothalamus
Definition
the part of your brain that links the nervous system and the endocrine system
Term
pituitary gland
Definition
works with the hypothalamus to control many body activities
Term
negative feedback
Definition
a system that is turned off by the condition it produces
Term
fertilization
Definition
the joining of an egg cell and a sperm cell
Term
egg
Definition
the female sex cell
Term
sperm
Definition
the male sex cell
Term
zygote
Definition
a fertilized egg
Term
testes
Definition
the organs in which sperm are produced
Term
testosterone
Definition
a hormone that controls the development of adult male characteristics
Term
scrotum
Definition
the pouch of skin where the testes are located
Term
semen
Definition
a mixture of sperm cells and fluids
Term
penis
Definition
the organ through which both semen and urine leave the male body
Term
ovaries
Definition
the female reproductive structures that produce eggs
Term
estrogen
Definition
a hormone that triggers the development of some adult female characteristics
Term
Fallopian tube
Definition
the passageway where an egg travels from the ovary to the uterus
Term
uterus
Definition
a hollow, muscular organ of the female reproductive system in which a fertilized egg develops
Term
vagina
Definition
a muscular passageway leading to the outside of the female body
Term
menstrual cycle
Definition
a monthly cycle of changes that occurs in females
Term
menstruation
Definition
the process in which the thickened lining of the uterus breaks down and blood and tissue then pass out of the female body through the vagina
Term
ovulation
Definition
the egg is released into the Fallopian tube
Term
embryo
Definition
from the two-cell stage through the eighth week in the birth cycle
Term
fetus
Definition
form the end of the eighth week until birth
Term
amniotic sac
Definition
a fluid filled sac that surrounds and protects the embryo and later the fetus
Term
placenta
Definition
the organ that links the developing embryo and the mother, and allows for the passage of materials between them
Term
umbilical cord
Definition
a ropelike structure that forms between the placenta and the embryo
Term
adolescence
Definition
the stage during which children start to become adults physically and mentally
Term
puberty
Definition
the period of physical sexual development that usually leads to the ability to reproduce
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