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Science > fertilization & pregnancy > Flashcards

fertilization & pregnancy Flashcards

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1
Q

Sexual Intercourse

A

Penis is inserted into the vagina until ejaculation occurs

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2
Q

Sperm

A

Male sex cell

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3
Q

Ova (egg)

A

Female sex cell

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4
Q

Ejaculation

A

The release of semen from the male reproductive organs

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5
Q

How long can sperm live in the female Fallopian tube?

A

usually 3-5, but sometimes up to 7 days

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6
Q

How long can sperm live/ survive outside of the body?

A

Only a few hours

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7
Q

What must happen in order for prego. to occur?

A

The sperm and ova must meet after/ during intercourse

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8
Q

How does the sperm travel to get to the ova (egg)?

A

The sperm travels up to the vagina, through the cervix, past the uterus, and into the Fallopian tube where fertilization occurs

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9
Q

Fertilization

A

The joining of egg and sperm cell

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10
Q

Up to how many sperm are released in 1 ejaculation, and how many can fuse with the ova?

A

As many as 40 million-1.2 billion sperm are released in 1 ejaculation, but only ONE can fuse with the ova

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11
Q

Implantation

A

Attaching the zygote to the uterine wall

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12
Q

Zygote

A

The fertilized egg

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13
Q

Embryo

A

From the 2 cell stage through the 8th week of development

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14
Q

Twins

A

Multiple birth (development of more than 1 baby from a single prego.)

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15
Q

Identical (monozygotic) twins

A

Single egg released from ovary and fertilized by 1 sperm

-fertilized egg then splits into 2 embryos

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16
Q

Fraternal (dizygotic) twins

A

2 eggs released from ovary and fertilized by 2 different sperm

17
Q

Amniotic Sac

A

Fluid filled sac that surrounds and protects the embryo

18
Q

Placenta

A

Membrane that forms on the wall of the uterus that links the mother and the developing fetus

19
Q

Can twins each have/make their own amniotic sac and placenta?

A

Yes, but they can also share one

20
Q

When do conjoined twins happen?

A

When a zygote fails to split completely during development in the womb

21
Q

Fetus

A

From the 9th week until birth (weeks 10-40ish)

22
Q

Umbilical Cord

A

Rope like structure attached to the placenta that forms between the mother and fetus; contains blood vessels that exchange nutrients and waste

Science (7 decks)

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