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flaws in developmen of human the human growth and development in spite of its complexity works perfectly most of the time but while development goes
placenta - human developmentwe had said previous in the unit that in the second week of development a primitive uteroplacental circulation is
extra-embryonic membranes and placenta the extra embryonic membranes like you already know provide nourishment and protection these membranes are
embryonic development the embryonic stage extends from the second week by the 8th week and is charactrised by formation of placenta the development
implantation - pre-embryonic developmentafter entering the uterus and formation of icm the blastocyst starts to embed in the endometrium of the
pre-embryo - human developmentabout thirty hours after fertilization the zygote goes through mitosis giving rise to 2 blastomeres these blastomeres
vitro fertilization - human developmentin case a woman cannot conceive due to her uterine tubes are blocked she can become pregnant by means of in
fertilization - pre-embryonic developmentovulation generally takes place between 9th to 14th day after the end of last menstrual period fertilization
pre-embryonic development we had said in the starting of the unit that prenatal development can be divided into two phases embryonic and foetal the
respiratory system - developmental changes after birththe new-borns lungs are collapsed and need powerful breaths to inflate them airways too are
spermatogenesis - gametogenesisthe procedure of maturation of spermatogonia into sperms starts at puberty about 14 years and continues into old age
gametogenesis - human developmentgametogenesis as you are responsive is the process of formation and development of specialized reproductive cells
human developmenthuman development is a continuous procedure that begins when the ovum from a female is fertilised via sperm from a male to form the
multicausal nature of cancer with several dividing cells in the organism and the various proto-oncogenes and tumor suppressor genes that can be
tumor suppressor genes tumor suppressor genes or anti-oncogenes generally inhibit cell division in cooperation with proto-oncogenes the very
proto-oncogenes proto-oncogenes are common genes present in all organisms and emerge to be highly conserved in the course of evolution they have been
mechanism of carcinogenesisin the preceding sub-section you learnt that carcinogenesis is a multistep process even though cancer may be caused by
causes of cancerwe know earlier that a malignant tumor is a large aggregation of cancer cells all of them descended from a single founder cell that
metastasis - characteristics define cancermetastasis is the capability of a malignant cell to detach itself from a tumor and establish a tumor in
anaplasia - characteristics define canceranaplasia is a structural abnormality where cells resemble primitive or embryonic tissue in which adult
characteristics define cancer - hyperplasiahyperplasia is the extreme proliferation of cells which can be observed in normal as well as cancerous
role of hormones in agingaging as well reflects the inefficiency of the endocrine system a change in the hormonal secretions may contribute to the
extracellular agingthe basic components of extracellular space are mucopolysaccharides and fibrous proteins particularly collagen and elastin these
physiological changes - consequences of agingvarious physiological regulatory mechanisms show decreased efficiency due to aging for instance normally
consequences of aging it is hard to enumerate the general consequences of aging in different animals gradual loss of reproductive ability