Embryonic development Flashcards by Skylynn Mercer | Brainscape

Q

What is fertilization?

A

union of sperm and egg

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Q

What cell results from sperm and egg fusing together?

A

Zygote

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Q

What undergoes cell division but does not grow?

A

Cleavage

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Q

What happens to Zygote when Cleavage begins?

A

It becomes an embryo

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Q

What is a hollow ball of cells?

A

Blastula

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Q

What two parts make up blastula?

A

1.) Inner cell mass
2.) trophoblast

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Q

When does implantation occur?

A

At the end of the first week

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Q

When do cells begin to differentiate?

A

Gastrulation

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Q

What cell layers form at the end of gastrulation?

A

1.) ectoderm
2.) mesoderm
3.) endoderm

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Q

What is ectoderm?

A

Skin and nervous system

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Q

What is Mesoderm?

A

organ systems and muscle

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Q

What is Endoderm?

A

Lungs and digestive tract

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Q

What is a cord of tissue and blood vessels?

A

The umbilical cord

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Q

Which trimester is the baby considered a fetus?

A

During the first trimester

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Q

What happens to Estrogen and Progesterone during birth?

A

Levels drop

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Q

What causes uterine contractions?

A

Oxytocin

Q

Which stage does the amnion break?

A

Dilation

Q

What is ¨after-birth”?

A

The placenta and umbilical cord

Q

What hormone controls milk production?

A

Prolactin