The process is divided into three time periods. Those three periods consist of the germinal period‚ the embryonic period‚ and the fetal period. In fact‚ the time period at which vulnerability to teratogens is the highest is actually the embryonic period. This primarily due to the fact that during this period‚ the major organ systems
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Hair is simple in describing its structure. However‚ socially‚ it consists of important functions. Hair is made of a tough protein called keratin(). Hair follicles are there to anchor each individual hair into the skin(). Hair bulbs begin forming the base of the hair follicle. In the hair bulb‚ living cells divide and expand to build the hair shaft(). Blood vessels nourish the cells in the hair bulb and deliver hormones that modify hair growth and structure at different times of life. Hair growth
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The germinal stage consist of when conception is starts to 2 weeks which the zygote implants itself in the mother’s uterine lining. The embryonic stage begins after the second seek but begins through and out the 3rd through the last 8th week. This point the blastocyst
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humans and almost all other organisms. Nearly every cell in a person’s body has the same DNA. Most DNA is located in the cell nucleus but a small amount of DNA can also be found in the mitochondria. 4) How long is the germinal stage? Explain what happens in this stage. The germinal stage lasts only about 2 weeks. Within just a few hours after conception‚ the single-celled zygote begins making a journey down the fallopian tube to the uterus where it will begin the process of cell division and growth
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Human Fertilisation and Development Each day cute little babies are born into this world and being dazzled by their beauty we forget all about the long complicating process that took place which made it possible to have a baby. Therefore in my essay I am going to discuss the human reproductive cell‚ fertilisation and the development of a human life. Humans reproduce sexually‚ with both parents contributing half of the genetic makeup of their offspring via sex cells or gametes. Gametes produced
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Reproduction Male sperm fuses with female egg. If tdf (a gene) is present‚ then the embryo develops testes and produces testosterone. Female Reproductive system • Female baby develops if tdf is not present. • Tdf – a gene located on Y chromosome; if girl‚ then two X chromosomes‚ hence no Tdf. • Female hormones: progesterone and estrogen ( both secreted by mother’s ovaries and placenta which allow female genetilia to develop. Parts of the female reproductive system:
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The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage; the third through the eighth week are known as the embryonic period; and the time from the ninth week until birth is known as the fetal period. The germinal stage begins with conception‚ when the sperm and egg cell unite in one of the two fallopian tubes. The fertilized egg‚ known as zygote then moves toward the uterus‚ a journey that can take up to a week to complete
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__A__ 1. The briefest period of prenatal development is the: a. germinal stage b. embryonic stage c. fetal stage d. baby-making stage _C___ 2. Motor development involves the acquisition of: a. sensory abilities including hearing and taste b. reflexive movements and abilities c. the muscular control necessary for coordinated movement d. language and speech patterns necessary for communication _A___ 3. Piaget called the incorporation of new objects into existing knowledge: a. assimilation
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Walt Whitman’s “Slang in America” and Burgess’ “A Defense of Slang”‚ both authors express how they favor slang and see it as a way to breathe life to language a sort of new style.The two authors do differ in which Whitman views poetry as a product of slang‚ whereas Burgess refers to slang as similar‚ but not as accepted as poetry is. Both authors believe that slang allows people to escape the unspoken laws of literalism and bring interest into the language. Whitman views slang as a way of people
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mitotic cell division. 2-Total mass does not increase but daughter cell increase in number. 3-Occure in zone pellucida. EMBRYO DEVELOPMENT Also called embryonic period. 1-Gastrulation: development of embryo comprise of a trilaminar germinal disc. 2- change in intraembryonic mesoderm i-Paraxial mesoderm: 35 pairs of somites are formed for determining age of embryo. ii-intermediate mesoderm: form urogenital ridge which is involved in formation of future kidney and gonads. iii-
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