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3. When successful (½ of zygotes fail to implant), implantation takes about 5 days, and is usually completed by the normally begins to 4. The trophoblast cells begin to secrete, the corpus, day after ovulation; just before the endometrium an LH-like hormone that keeps viable and secreting estrogen & progesterone, which in turn maintain the endometrium. Levels of these 2 hormones rise as pregnancy advances. 5. The which develops from the trophoblast after implantation, continues to make hCG. All tests today measure hCG levels. D. Embryonic Development: 2 1. It is called an embryo for the first, it is called a months of development; after week disc, from a) ("outer skin"): the nervous system and epidermis of the 2. The inner cell mass is now a thick plate called the which the 3 germ layers (embryonic tissues from which all organs develop) arise: b). c) skin will arise from this layer. ("inner skin"): forms the epithelial linings of digestive, respiratory and urogenital tracts, and associated glands. ("middle skin"): forms almost everything else (muscles, bones, blood, heart, vessels, cartilages, etc.) 3. Four embryonic membranes lie outside the embryo to protect and nourish it: a) : a sac hanging from the ventral surface of the embryo. It doesn't supply embryo with nutrients, as it does in bird eggs. Instead, it: 1) forms part of the gut (digestive tube) and 2) is the site of early b) filled with a thin, transparent membrane surrounding the embryo. It is fluid (derived from mother's blood and fetal urine). c d) ; allows fetal It cushions & protects the fetus; regulates fetal, movement (so muscles & bones can grow). Often called the "bag of waters", it ruptures just before giving birth. a small finger-like pouch that develops from the back of cord that links the yolk sac. It is the structural base for the the embryo to the placenta, and becomes part of the : derived from the It surrounds the embryo, and becomes the embryonic part of the placenta. It has many finger-like which dig into the endometrium and projections called chorionic into maternal blood spaces (nutrients diffuse to embryo and wastes diffuse away) tap

3. When successful (½ of zygotes fail to implant), implantation takes about 5 days, and is usually completed by the normally begins to 4. The trophoblast cells begin to secrete, the corpus, day after ovulation; just before the endometrium an LH-like hormone that keeps viable and secreting estrogen & progesterone, which in turn maintain the endometrium. Levels of these 2 hormones rise as pregnancy advances. 5. The which develops from the trophoblast after implantation, continues to make hCG. All tests today measure hCG levels. D. Embryonic Development: 2 1. It is called an embryo for the first, it is called a months of development; after week disc, from a) ("outer skin"): the nervous system and epidermis of the 2. The inner cell mass is now a thick plate called the which the 3 germ layers (embryonic tissues from which all organs develop) arise: b). c) skin will arise from this layer. ("inner skin"): forms the epithelial linings of digestive, respiratory and urogenital tracts, and associated glands. ("middle skin"): forms almost everything else (muscles, bones, blood, heart, vessels, cartilages, etc.) 3. Four embryonic membranes lie outside the embryo to protect and nourish it: a) : a sac hanging from the ventral surface of the embryo. It doesn't supply embryo with nutrients, as it does in bird eggs. Instead, it: 1) forms part of the gut (digestive tube) and 2) is the site of early b) filled with a thin, transparent membrane surrounding the embryo. It is fluid (derived from mother's blood and fetal urine). c d) ; allows fetal It cushions & protects the fetus; regulates fetal, movement (so muscles & bones can grow). Often called the "bag of waters", it ruptures just before giving birth. a small finger-like pouch that develops from the back of cord that links the yolk sac. It is the structural base for the the embryo to the placenta, and becomes part of the : derived from the It surrounds the embryo, and becomes the embryonic part of the placenta. It has many finger-like which dig into the endometrium and projections called chorionic into maternal blood spaces (nutrients diffuse to embryo and wastes diffuse away) tap

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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3. When successful (½ of zygotes fail to implant), implantation takes about 5 days, and is usually completed by the normally begins to 4. The trophoblast cells begin to secrete, the corpus, day after ovulation; just before the endometrium an LH-like hormone that keeps viable and secreting estrogen & progesterone, which in turn maintain the endometrium. Levels of these 2 hormones rise as pregnancy advances. 5. The which develops from the trophoblast after implantation, continues to make hCG. All tests today measure hCG levels. D. Embryonic Development: 2 1. It is called an embryo for the first, it is called a months of development; after week disc, from a) ("outer skin"): the nervous system and epidermis of the 2. The inner cell mass is now a thick plate called the which the 3 germ layers (embryonic tissues from which all organs develop) arise: b). c) skin will arise from this layer. ("inner skin"): forms the epithelial linings of digestive, respiratory and urogenital tracts, and associated glands. ("middle skin"): forms almost everything else (muscles, bones, blood, heart, vessels, cartilages, etc.) 3. Four embryonic membranes lie outside the embryo to protect and nourish it: a) : a sac hanging from the ventral surface of the embryo. It doesn't supply embryo with nutrients, as it does in bird eggs. Instead, it: 1) forms part of the gut (digestive tube) and 2) is the site of early b) filled with a thin, transparent membrane surrounding the embryo. It is fluid (derived from mother's blood and fetal urine). c d) ; allows fetal It cushions & protects the fetus; regulates fetal, movement (so muscles & bones can grow). Often called the "bag of waters", it ruptures just before giving birth. a small finger-like pouch that develops from the back of cord that links the yolk sac. It is the structural base for the the embryo to the placenta, and becomes part of the : derived from the It surrounds the embryo, and becomes the embryonic part of the placenta. It has many finger-like which dig into the endometrium and projections called chorionic into maternal blood spaces (nutrients diffuse to embryo and wastes diffuse away) tap
Transcribed Image Text:3. When successful (½ of zygotes fail to implant), implantation takes about 5 days, and is usually completed by the normally begins to 4. The trophoblast cells begin to secrete, the corpus, day after ovulation; just before the endometrium an LH-like hormone that keeps viable and secreting estrogen & progesterone, which in turn maintain the endometrium. Levels of these 2 hormones rise as pregnancy advances. 5. The which develops from the trophoblast after implantation, continues to make hCG. All tests today measure hCG levels. D. Embryonic Development: 2 1. It is called an embryo for the first, it is called a months of development; after week disc, from a) ("outer skin"): the nervous system and epidermis of the 2. The inner cell mass is now a thick plate called the which the 3 germ layers (embryonic tissues from which all organs develop) arise: b). c) skin will arise from this layer. ("inner skin"): forms the epithelial linings of digestive, respiratory and urogenital tracts, and associated glands. ("middle skin"): forms almost everything else (muscles, bones, blood, heart, vessels, cartilages, etc.) 3. Four embryonic membranes lie outside the embryo to protect and nourish it: a) : a sac hanging from the ventral surface of the embryo. It doesn't supply embryo with nutrients, as it does in bird eggs. Instead, it: 1) forms part of the gut (digestive tube) and 2) is the site of early b) filled with a thin, transparent membrane surrounding the embryo. It is fluid (derived from mother's blood and fetal urine). c d) ; allows fetal It cushions & protects the fetus; regulates fetal, movement (so muscles & bones can grow). Often called the "bag of waters", it ruptures just before giving birth. a small finger-like pouch that develops from the back of cord that links the yolk sac. It is the structural base for the the embryo to the placenta, and becomes part of the : derived from the It surrounds the embryo, and becomes the embryonic part of the placenta. It has many finger-like which dig into the endometrium and projections called chorionic into maternal blood spaces (nutrients diffuse to embryo and wastes diffuse away) tap
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