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Questions and Answers
What is the first stage of fetal development?
What is the first stage of fetal development?
- Embryonic stage
- Pre-embryonic stage (correct)
- Neonatal stage
- Fetal stage
Where does fertilization typically occur?
Where does fertilization typically occur?
Outer third of the fallopian tube
The embryonic stage occurs between weeks 3 to 8 of development.
The embryonic stage occurs between weeks 3 to 8 of development.
True (A)
The lifespan of a spermatozoon is approximately _____ hours.
The lifespan of a spermatozoon is approximately _____ hours.
How long can the egg be fertilized after ovulation?
How long can the egg be fertilized after ovulation?
What surrounds the egg during ovulation?
What surrounds the egg during ovulation?
More than one sperm can enter the egg during fertilization.
More than one sperm can enter the egg during fertilization.
The total critical time frame for successful fertilization is about _____ hours.
The total critical time frame for successful fertilization is about _____ hours.
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Study Notes
Antepartal Care: Fetal Development
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Fetal development occurs in three stages:
- Pre-embryonic stage (first 2 weeks)
- Embryonic stage (weeks 3 to 8)
- Fetal stage (week 8 until birth)
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Fertilization marks the beginning of pregnancy, involving the fusion of an egg and sperm.
Fertilization Details
- Fertilization typically occurs in the outer third of the fallopian tube, specifically the ampullar section.
- Each month, only one ovum matures and is released during ovulation.
- The ovulated egg can be fertilized within a 24-hour window after release.
- Sperm have a lifespan of approximately 48 hours but can live up to 72 hours in favorable conditions.
Critical Fertilization Window
- The optimal window for fertilization is about 72 hours, incorporating:
- 48 hours prior to ovulation
- 24 hours post-ovulation
Fertilization Process
- The release of the ovum (egg) during ovulation is accompanied by protective layers and cells.
- After release, the egg moves into the fallopian tube aided by tiny hair-like structures and contractions of the tube.
- During ejaculation, millions of sperm are released, rapidly traveling through the cervix and uterus to the fallopian tube.
- Sperm reach the fallopian tube within minutes, clustering around the egg to penetrate its protective layer through enzymatic action.
- Only one sperm can enter the egg; once successful, the egg's membrane prevents additional sperm entry, leading to the union of genetic material from both sperm and egg.
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