Human Reproduction
Human Reproduction PDF Notes, Important Questions and Synopsis
SYNOPSIS
- Human Reproductive System
- The primary sex organs—the testes in males and the ovaries in females—produce gametes, i.e. sperms and ovum. This process is called gametogenesis.
- Spermatogenesis is the process where sperm mother cells in seminiferous tubules of the testes change into haploid spermatozoa.
- Oogenesis is the process of formation of haploid ova in the Graafian follicles of the ovary.
- Ovulation is the process where the mature ovum at the secondary oocyte stage is released from the ovary by the rupturing of its Graafian follicles.
- The first menstruation begins at puberty and is called menarche.
- A phase in a woman’s life where permanent cessation of menstruation occurs is called menopause.
- The menstrual cycle is the rhythmic series of changes in the sex organs which occur after every 28 days.
- Phases of the Menstrual Cycle
- The process of fusion of a sperm with an ovum is called fertilisation.
- Implantation is the fixing of the fertilised ovum in the tissues of the uterus.
- The placenta is an organic temporary connection between the mother and the foetus during pregnancy.
- Parturition is the process of expulsion of the foetus from the uterus.
- The signals for parturition originate from the fully developed foetus and the placenta which induce mild uterine contractions called foetal ejection reflex.
- Colostrum is the first milk which comes out from the mother’s mammary glands after the birth of the baby.
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