Question:
Fertilization in humans is practically feasible only if -
Fertilization in humans is practically feasible only if -
Updated On: Apr 20, 2025
- The ovum and sperms are transported simultaneously to ampullary-isthmic junction of the fallopian tube
- The ovum and sperms are transported simultaneously to ampullary-isthmic junction of the cervix
- The sperm are transported into cervix within 48 hrs of release of ovum in uterus
- The sperm are transported into vagina just after the release of ovum in fallopian tube
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The Correct Option is A
Solution and Explanation
- In human reproduction, fertilization generally occurs at the ampullary-isthmic junction of the fallopian tube.
- For successful fertilization, both the ovumsperms (deposited in the vagina) must reach this site at the same time.
- This ensures that the sperm can penetrate and fertilize the ovum before it degenerates (typically viable for 24 hours).
Incorrect options:
- Option 2: Cervix is not the site of fertilization.
- Option 3: Fertilization occurs in the fallopian tube, not uterus.
- Option 4: Vaginal deposition is normal, but timing must match ovulation, and fertilization doesn’t happen in the vagina.
Therefore, the correct condition for fertilization is when both ovum and sperm meet at the ampullary-isthmic junction of the fallopian tube.
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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.