NEET > Biology Class 12 > Short Tricks: Human Reproduction
Short Tricks: Human Reproduction Video Lecture - Biology Class 12 - NEET
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FAQs on Short Tricks: Human Reproduction Video Lecture - Biology Class 12 - NEET
| 1. What are the main stages of human reproduction? |  |
Ans. Human reproduction consists of several stages. The first stage is the production of gametes (sperm and egg) through a process called gametogenesis. This is followed by fertilization, where the sperm and egg fuse to form a zygote. The zygote then undergoes a series of cell divisions called cleavage, resulting in the formation of an embryo. The embryo implants itself into the uterine lining during the process of implantation. Finally, the embryo develops into a fetus and grows inside the uterus until birth.
| 2. How is sperm production regulated? | |
Ans. Sperm production is regulated by a complex feedback mechanism involving hormones. The hypothalamus in the brain secretes Gonadotropin-Releasing Hormone (GnRH), which stimulates the pituitary gland to release Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH). FSH stimulates the Sertoli cells in the testes to promote sperm production, while LH stimulates the Leydig cells to produce testosterone, which is essential for spermatogenesis. Testosterone also provides negative feedback to the hypothalamus and pituitary gland to regulate the production of GnRH, FSH, and LH.
| 3. How does the menstrual cycle relate to human reproduction? | |
Ans. The menstrual cycle is a recurring process in females that prepares the body for pregnancy. It involves the monthly release of an egg from the ovary, called ovulation, and the thickening of the uterine lining in preparation for implantation. If fertilization occurs, the fertilized egg implants into the uterine lining and pregnancy begins. If fertilization does not occur, the uterine lining sheds, resulting in menstruation. The menstrual cycle is regulated by hormones, primarily estrogen and progesterone, which are secreted by the ovaries.
| 4. What is the role of the placenta in human reproduction? | |
Ans. The placenta plays a crucial role in human reproduction. It is an organ that develops during pregnancy and provides a connection between the mother and the developing fetus. The placenta allows for the exchange of nutrients, oxygen, and waste products between the mother's bloodstream and the fetus. It also produces hormones, such as human chorionic gonadotropin (hCG), which helps maintain pregnancy and supports the development of the fetus. Additionally, the placenta acts as a protective barrier, preventing harmful substances from reaching the fetus.
| 5. How does the male reproductive system contribute to human reproduction? | |
Ans. The male reproductive system plays a vital role in human reproduction. It produces and delivers sperm, which is necessary for fertilization. The testes are responsible for sperm production through a process called spermatogenesis. The sperm are then stored and matured in the epididymis before being ejaculated during sexual intercourse. The male reproductive system also produces seminal fluid, which nourishes and protects the sperm. During ejaculation, the sperm and seminal fluid travel through the vas deferens, mix with secretions from the prostate and seminal vesicles, and are expelled through the urethra.
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