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9 Cards in this Set
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Gestation |
It contains developmental events from conception till birth of the young one . 280 days from start of last menstrual cycle Three sequential processes:- .cleavage and blastulation (rapid divisions of the zygote to form a multicellular body called blastomeres) .gastrulation (movement of cells to form germ layers) .organogenesis (differentiation of cells at specific places in the germ layers to form tissues, organs and organ systems) |
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Parturition |
Childbirth in viviparous mammals is called parturition. The birth of child means its expulsion from uterus of mother. 9 months 10 days The birth of the child is effected by labour pains caused by the contraction of the uterine wall. ( caused by oxytocin released by pituitary ) |
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Mentruation |
Blood discharge Uterus lineing which got thickened earlier in readiness to receive the embryo breaks down causing discharge of blood and mucus Corpus luteum degenerates New follicle begins to develop. |
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Repair and regeneration |
Uterus lining begins to regenerate Graafian follicle develops |
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Follicular phase / proliferative phase |
Uterus lining rethickens with lot of blood supply Glands become longer Follicle matures Oestrogen secreted from follicle influences uterine wall to thicken to recieve embryo |
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Luteal phase |
Uterus lining thickens further in readiness to receive the fertilized egg Emptied follicle turns into corpus luteum which produces the hormone progesterone that influences thickening of uterus. |
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Surrogate mother |
Any such woman who offers to carry someone else's embryo in her own womb till completion of pregnancy and delivers the baby. |
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Test tube baby |
Normal conception is not possible in some women In such cases , ovum is taken and fertilized by the sperm of her husband in a test tube and when it reaches 32 cell stage it is implanted inside the uterus of the mother. |
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Artificial insemination |
When sperms are transferred to the female body by artificial means , that is other than natural process, then the insemination is called artificial insemination. .usually adopted to improve cattle breed .three steps:- .collection of semen of good quality cattle by artificial means .proper preservation and storage of semen .transfer of the semen into the vagina of the female |
