54 terms

6th Grade Science-Reproductive System

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Terms in this set (...)

Reproduction is essential to what?
the survival of the species
What is reproduction NOT essential to?
the survival of the individual
What is reproduction?
the process through which living things produce new individuals of the same kind
What kind of specialized cells does the reproductive system produce, store, nourish, and release?
sex cells(gametes)
sperm
male sex cell
egg (ovum)
female sex cell
fertilization
when the sperm and egg unite
Where are chromosomes located?
in each cell of the body
How many chromosomes do normal cells contain?
46
How many chromosomes do sex cells contain?
23
zygote
a fertilized egg that contains 46 chromosomes
testes
male reproductive organ
Where are the testes located?
in the scrotum
What is the role of the testes?
they produce sperm and the hormone testosterone
Why is it important that the testes are not located within the body cavity?
sperm cannot be produced and are destroyed at 98.6 degrees (normal body temperature)
A mixture of sperm, salts and other materials
semen
urethra
the duel purpose tube through which sperm (mixed with semen) travel---in a male
penis
where the sperm exits the body
testosterone
the male hormone that is produced in the testes
What is the hormone testosterone responsible for?
facial and body hair, broadening the chest, a deeper voice-secondary sexual characteristics
ovaries
the female reproductive organ
Where are the ovaries located?
at the hip level, one on each side
What is the role of the ovaries?
they produce an egg (ova)
Where are all female reproductive parts located?
WITHIN the female body
What releases the egg?
ovaries
Once the egg is released from the ovaries, where does it go?
the fallopian tubes (oviduct)
After leaving the fallopian tubes, where does the egg go?
uterus (womb)
Where does a fertilized egg develop?
It implants in the uterus
cervix
an opening at the mouth of the uterus
vagina
birth canal
What is the path that the egg travels?
fallopian tubes-uterus-cervix-vagina
estrogen
a female hormone produced in the ovaries
What is the job of estrogen?
it is responsible for broadening the hips, enlarging the breasts, and the maturation and release of eggs-female secondary sexual characteristics
About how often does a menstrual cycle occur?
monthly
About how long does a menstrual cycle last?
28 days
What is the purpose of the menstrual cycle?
to prepare the uterus for a fertilized egg
What occurs during days 1-4 of the cycle?
menstrual discharge
What occurs during days 5-13 of the cycle?
egg matures inside the ovary
What occurs during days 14-15 of the cycle?
ovulation
ovulation
when the egg is released from the ovary
What occurs during days 16-22 of the cycle?
the egg travels through the fallopian tube toward the uterus
What occurs during days 23-28 of the cycle?
1. fertilized egg imbeds in the side of the uterus OR 2. unfertilized egg is released through mensturation
When is the only time an egg can be fertilized?
during ovulation
When does ovulation occur?
about 14 days after the start of menstruation
What is the first step in development before birth?
zygote (fertilized egg with 46 chromosomes)
embryo
1st-8th week of development before birth
amniotic sac
fluid-filled sack that cushions and products baby throughout development
placenta
connects baby to mother and provides nourishment, respiration, and excretion
fetus
a baby from the 8th week until it is born
umbilical cord
connects fetus to the placenta...has 2 arteries and 1 vein
puberty
when sexual organs begin to develop
What occurs during puberty to girls?
menstruation begins
What occurs during puberty to boys?
sperm is produced
menopause
females stop menstruation and ovulation

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