Implantation in Human

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Pregnancy in humans includes several stages, and it lasts for 280 days or 40 weeks on average. Implantation is an initial stage of pregnancy found in the female human body. In this stage, human embryo is attached to the uterus wall.

Define Implantation

The stage of human pregnancy in which an embryo adheres to the uterus wall is known as implantation. During this prenatal developmental stage, the conceptus is termed as a blastocyst. After this adhesion, an human embryo receives required nutrients and oxygen to grow from the mother's body.

The following steps describe the process along with what happens after implantation.

Implantation Process

  • Every 28 days or so, a human ovary releases one mature egg. This process is known as ovulation. After ovulation, fertilisation process starts as the egg moves through the fallopian tube and can stay in the tube for about 24 hours.

  • During sex, a male sperm cells travel through female reproductive tract and try to merge with the egg within fallopian tubes proximity.

  • Once a sperm cell fuses with an egg cell, the conception process starts. After conception, the sperm fertilises an egg, which is called fertilisation. During this stage, a single cell zygote is created by merging both egg and sperm cells.

  • This zygote divides rapidly and moves toward the uterus through the fallopian tube.

  • A fertilised egg needs near about 7 days to reach the uterus. During this movement, through multiple cell divisions, the zygote turns into almost a 200-celled blastocyst.

  • After reaching uterus, the blastocyst remains in uterine cavity for one day and eventually adheres to the uterine lining, endometrium.

  • In the next step, outer surface of a fertilised ovum starts developing, and blastocyst moves inside the deeper tissue distorting its lining.

  • After fertilisation, the blastocyst takes 11 days to insert itself entirely into endometrium.

Do You Know

What is the Meaning of Implantation?

As the name suggests, what is implantation signifies when something is implanted. For human pregnancy, implantation is the initial stage where an embryo attaches to uterine lining for its prenatal developments.

Implantation Duration and Symptoms

Once the sperm fuses with an egg and fertilises, the zygote transports towards the uterus through multiple cell divisions. After conception process, a fertilised ovum takes 7-14 days to implant itself with uterus wall. 

Females can notice some symptoms after a successful implantation.

  • Implantation bleeding or spotting.

  • Nausea.

  • Mood swings.

  • Mild cramps.

  • Headaches.

  • Tender and sensitive breasts.

  • Change in tastes.

  • Bloating.

  • Constipation.

  • Blocked nose.

  • Fatigue or tiredness.

Implantation Bleeding

Most females experience implantation bleeding during the early stage of their pregnancy. It starts as an embryo adheres to the uterus wall, the endometrium. Due to this embryonic movement, expecting mother experiences pink or brown vaginal discharge. Implantation bleeding is also known as spotting. It is one of the most crucial indications and one of the answers for ‘what are the symptoms of implementation’.

Spotting happens between 7-14 days after conception, which is a few days earlier to the upcoming menstrual cycle. Thus, females often confuse between implantation bleeding and monthly period. However, spotting is completely normal during this stage of pregnancy.

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FAQ (Frequently Asked Questions)

1. What is Implantation in Biology?

Ans. Implantation in biology refers to an early stage of human pregnancy. During this stage, the fertilised ovum or egg attaches to the endometrium and receives nutrients and oxygen for its prenatal growth. 

2. What happens During Implantation?

Ans. Once sperm fertilises an egg, it creates a uni-celled zygote. This zygote moves towards the womb or uterus through multiple and rapid cell divisions. After sticking to the uterus wall, a fertilised egg gradually inserts itself into deeper tissues of the uterus during implantation.

3. What are the Signs of Successful Implantation?

Ans. The most evident signs of successful implantation are implantation bleeding, tender breasts, mood swings, headache, cramps, bloating, tiredness, etc.