16 Questions
What happens to the sperm during fertilization?
Millions are killed due to acidity, blocked by cervical mucus, and killed by leukocytes.
What is the purpose of the acrosomal reaction?
To release enzymes to penetrate the corona radiata and zona pellucida.
What forms after fertilization to prevent polyspermy?
The fertilization membrane
What is the percentage of blastocysts that fail implantation?
50%-75%
What is the function of the yolk sac?
To provide nourishment until the placenta is functional.
During which week is the placenta complete?
Week 4-12
What is the purpose of the zona pellucida?
To facilitate sperm binding and penetration.
What is the result of fertilization?
The formation of a zygote.
What is the function of hCG?
To keep the corpus luteum healthy and secreting progesterone.
What is the result of implantation?
The uterine mucosa rebuilding and enveloping the blastocyst.
What is the primary method of transport for Oxygen and Carbon Dioxide across the placenta?
Simple diffusion
During which weeks does the placenta take over the endocrine function from the corpus luteum?
Weeks 12-17
What is the function of the hormone Relaxin during pregnancy?
Loosening the pelvis and dilating the cervix
When does sexual differentiation typically begin in a fetus?
Weeks 9-12
What is the function of the hormone Progesterone during pregnancy?
Inhibiting contractions
What is the primary role of the hormone hCG during pregnancy?
Stimulating male gonads to produce testosterone
Learn about the process of fertilization, where a sperm and an oocyte combine to form a zygote, and how genetic material from both parents is inherited. Discover the obstacles sperm face, including acidity, cervical mucus, and phagocytic leukocytes, and how the surviving sperm finally reach the fallopian tubes.
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