Briefly explain the event of fertilisation and implantation in an adult human female
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Answer:
Fertilization: It is the entry of mature ovum by spermatozoa and the combination of a male and female head dictionary. In the process, a sperm containing thousands of sperm is penetrated into the vagina. After re-entry with the help of the cervical organs they begin to clear their way into the fallopian tube to meet the ovum. The upper distance covers, the sperm count decreases and very few sperm reach the egg. The egg is covered by a protective layer called the zona pellucida. The sperm reaching the egg hatches the egg cell at the contact surface with the help of the acrosome (a lysosome) located in the region outside the sperm head. Then it releases its contents into the egg and interacts with the egg nucleus. Planting is accomplished in this step. Once fertilization has occurred some sperm are prevented from entering the egg due to alterations in the cell membrane. Both sperm and egg can show their vitality over a period of time. The sperm lasts for 48-72 hours in the female reproductive system and the egg can be fertilized up to 24 hours after release.
Incubation: Once fertilization has occurred, the cell begins to divide and multiply within 24 hours on the fallopian tube. This complex structure with many metals is called the zygote. Later, after 3-4 days it travels to the uterus and we now call it Blastula. The blastula comes under various stages and is attached to the cervix in the uterus. This attachment process is known as the implant.