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Respiratory Block > Embryology 1 > Flashcards

Embryology 1 Flashcards

1
Q

What does the spermatogonium produce?

A

4 sperm

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2
Q

What does the oogonium produce?

A

1 ova and 3 polar bodies

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3
Q

When does meiosis i occur in females?

A

Whilst in utero

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4
Q

What is fertilisation?

A

Pro nucleus of a sperm fuses with the pro nucleus of an ovum to form a zygote (diploid)

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5
Q

The zygote divides to form a solid ball of cells, what is the term used to describes this new structure?

A

Morula

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6
Q

What does the morula become?

A

Blastocyst

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7
Q

What are the 3 components of a blastocyst?

A

Inner cell mass

Blastocystic cavity

Trophoblast

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8
Q

On what day is a blastocyst formed?

A

5th

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9
Q

How long does the first division of the zygote take?

A

Approximately 36 hours

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10
Q

How is the zygote able to move?

A

Ciliated epithelial tissue

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11
Q

How can etopic pregnancy occur?

A

If cilia function is abnormal

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12
Q

What does the trophoblast form?

A

Chorion

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13
Q

What are the 3 functions of the chorion?

A

Implantation process (via chorionic villi)

Forms part of the placenta

Secretes human chorionic gonadotropin (HCG)

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14
Q

How can pregnancy be detected?

A

Presence of human chorionic gonadotropin (hcg) in blood

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15
Q

What is the role of human chorionic gonadotropin?

A

It signals to ovary to continue to produce oestrogen and progesterone

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16
Q

What causes morning sickness in pregnancy?

A

High levels of HCG

17
Q

What does the inner cells of the blastocyst form?

A

Bilaminar disc

18
Q

What are the 2 cavities created by the bilaminar disc?

A

amniotic sac and yolk sac

19
Q

What are the 2 layers of the bilaminar disc?

A

Epiblast and hypoblast

20
Q

What are the 3 main functions of the placenta?

A

Exchange gas

Waste

Foetal nutrient

Immune

21
Q

What are fraternal twins?

A

2 eggs fertilised by different sperm

22
Q

What are identical twins?

A

Develop from a single fertilised egg that splits in two.

Respiratory Block (14 decks)

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