Question:

Identify the human developmental stage shown below as well as the related right place of its occurrence in a normal pregnant woman, select the right option for the two, together. Dev elopmental - Site of occurrence stage

Updated On: Jul 20, 2024

Late morula - middle part of Fallopian tube
Blastula - end part of Fallopian tube
Blastocyst - uterine wall
8-celled morula - starting point of Fallopian tube

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The Correct Option is C

Solution and Explanation

After fertilization, zygote undergoes rapid mitotic divisions, called cleavage, which is characterized by absence of growth of daughter cells. This leads to the conversion of single celled zygote into a multicellular structure called blastocyst or blastula. Implantation or embedding of zygote into endometrium of uterus occurs in blastocyst stage. The various stages in the journey of a fertilized egg from fertilization in the Fallopian tube to the implantation site in the uterus is illustrated in the given figure. Blastocyst comes in contact with the endometrium in the region of embryonal knob or embryonic disc. It adheres to the same. The surface cells of trophoblast secrete lytic enzymes which cause corrosion of endometrial lining. They also give rise to finger-like outgrowths called chorionic villi. Chorionic villi and uterine tissue become interdigitated. Villi not only help in fixation but also absorption of nourishment.

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Concepts Used:

Human Reproduction

Reproduction in human beings involves the fusion of male and female gametes that produces in their reproductive system.

Male Reproductive System:

The male reproductive system comprises:

Testicles (testes): A pair of oval-shaped organs masked in a pouch known as the scrotum. They manage the production of sperms and the male hormone testosterone.
Scrotum: It is a sac-like organ that hangs under the penis and behind it. It is the house of the testes, or testicles, and maintains a temperature that is needed for the production of sperm by it.
Vas deferens: The sperms produced in testes are stored in a tube known as the epididymis. Here the sperms get matured and pass to the urethra via the muscular tube known as vas deferens.
Accessory glands: This includes three glands, namely the prostate gland, seminal vesicles, and Cowper’s gland. The secretions from the mentioned three glands mix to form a fluid known as semen. Semen nourishes the sperm, raises the volume, and helps in lubrication.
Penis: The penis is a cylindrical tube that serves as both an excretory organ, and a reproductive organ. It transfers sperms into the vagina during sexual intercourse.

Female Reproductive System:

The female reproductive system is active before, during, and after fertilization as well. It comprises the following parts:

A pair of ovaries: A pair of ovaries produce and stores ovum in them. They also produce a female hormone known to be estrogen.
Fallopian tubes (Oviducts): They are the area of fertilization. They connect both the ovaries with the uterus.
Uterus: Uterus is the place of development for the embryo.
Vagina: The part that connects the cervix to the external female body parts is called a vagina. It is the passage for the penis during coitus as well as a fetus during transfer.