chapt17LectureOutlines

chapt17LectureOutlines - Chapter 17 Development and Aging...

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1 Chapter 17 Development and Aging What do you see in this picture? Let’s take a closer look.
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3 Outline Fertilization Pre-Embryonic and Embryonic Development Fetal Development Pregnancy and Birth Development after Birth (including Aging ) DON’T FORGET TO – read about Amber and Kent Forrest as progress through the chapter.
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4 Fertilization - is the union of sperm and egg. Steps of fertilization ( Conception ). Several sperm penetrate corona radiata. Several sperm attempt to penetrate zona pellucida. One sperm enters egg and nuclei fuse, producing a zygote . Egg’s plasma membrane and zona pellucida change to prevent polyspermy .
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5 Fertilization
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6 Pre-Embryonic and Embryonic Development Refer to Table 17.1 (Human Development) Processes of development . Cleavage - Cell division without growth. Growth - Increase in size of cells. Morphogenesis - Shaping of embryo. Differentiation - Cells take on specific structure and function.
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7 Extra embryonic Membranes Membranes that extend out beyond the embryo. Amnion - Provides fluid environment for developing embryo and fetus. Yolk sac - First site of red blood cell formation. Allantois - Contributes to cardiovascular system. Chorion – outermost membrane, develops from the trophoblast, contributes to the placenta.
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8 Extraembryonic Membranes
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9 Pre-Embryonic and Embryonic Development Occurrence of Pregnancy When a zygote begins dividing, it is termed an embryo ( pre-embryo ). Developing embryo travels down oviduct and eventually implants in endometrium. ( Implantation / pregnancy ) Presence of human gonadotropic hormone ( HCG ) in the blood confirms pregnancy. If implantation does not occur, a woman never knows fertilization took place. Ectopic pregnancy ?
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10 Human Development before Implantation
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Following implantation , the placenta originates from maternal and fetal tissues. Placenta then produces human chorionic gonadotropin ( HCG ) which maintains the corpus luteum in the ovary until the placenta begins its own production of progesterone and estrogen. Physical signs of pregnancy include
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chapt17LectureOutlines - Chapter 17 Development and Aging...

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