Textbook Question
Name the primary placental hormones and their functions.
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Ch. 29 Development and Inheritance
Martini, Nath, Bartholomew12th EditionFundamentals of Anatomy and PhysiologyISBN: 9780137854011
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Table of contents
- Ch. 1 An Introduction to Anatomy and Physiology25
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization29
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure33
- Ch. 7 The Axial Skeleton11
- Ch. 8 The Appendicular Skeleton17
- Ch. 9 Joints13
- Ch. 10 Muscle Tissue12
- Ch. 11 The Muscular System28
- Ch. 12 Nervous Tissue18
- Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes22
- Ch. 14 The Brain and Cranial Nerves20
- Ch. 15 Sensory Pathways and the Somatic Nervous System17
- Ch. 16 The Autonomic Nervous System and Higher-Order Functions30
- Ch. 17 The Special Senses15
- Ch. 18 The Endocrine System21
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation26
- Ch. 22 The Lymphatic System and Immunity25
- Ch. 23 The Respiratory System4
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes30
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance17
Martini, Nath, Bartholomew12th EditionFundamentals of Anatomy and PhysiologyISBN: 9780137854011Not the one you use?Change textbook
Chapter 28, Problem 17
Problems involving the formation of the chorion would affect
(a) The embryo’s ability to produce blood cells
(b) The formation of limbs
(c) The embryo’s ability to derive nutrition from the mother
(d) Lung formation
(e) The urinary system
Verified step by step guidance1
Step 1: Understand the role of the chorion in embryonic development. The chorion is one of the extraembryonic membranes that contributes to forming the placenta, which is essential for nutrient and gas exchange between the mother and the embryo.
Step 2: Recognize that the chorion's primary function is related to supporting the embryo by facilitating the transfer of nutrients and oxygen from the mother to the developing embryo, rather than directly forming embryonic tissues like limbs, lungs, or the urinary system.
Step 3: Analyze each option in the problem: (a) blood cell production is mainly from the yolk sac and later fetal liver and bone marrow; (b) limb formation is a function of the embryo's mesoderm; (c) nutrition from the mother is linked to the placenta, which involves the chorion; (d) lung formation is part of the embryo's endodermal development; (e) the urinary system develops from the mesoderm.
Step 4: Conclude that problems with the chorion would most directly affect the embryo's ability to derive nutrition from the mother, since the chorion is integral to placenta formation and nutrient exchange.
Step 5: Therefore, the correct focus is on the function related to maternal-fetal nutrient transfer, which corresponds to option (c).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chorion and Its Role in Embryonic Development
The chorion is an extraembryonic membrane that contributes to forming the placenta, facilitating nutrient and gas exchange between the mother and embryo. It surrounds the embryo and other membranes, playing a crucial role in supporting embryonic growth by enabling maternal-fetal nutrient transfer.
Recommended video:
0:43
Embryonic Development (Weeks 3-8) Example 3
Placenta Formation and Maternal-Fetal Nutrition
The placenta develops partly from the chorion and is essential for providing oxygen and nutrients to the embryo while removing waste. Problems in chorion formation can impair placental function, leading to inadequate nutrition and oxygen supply to the developing embryo.
Recommended video:
2:19The Placenta
Embryonic Structures Derived from the Chorion
Unlike organs such as limbs, lungs, or the urinary system, which develop from the embryo's germ layers, the chorion is an extraembryonic structure. Its primary function is not organogenesis but supporting the embryo through nutrient exchange, so defects mainly affect embryonic nutrition rather than direct organ formation.
Recommended video:
0:43Embryonic Development (Weeks 3-8) Example 3
Related Practice
Textbook Question
A normally pigmented woman whose father was an albino marries a normally pigmented man whose mother was an albino. What is the probability that they would have an albino child?
(a) 50 percent
(b) 25 percent
(c) 12.5 percent
(d) 6.25 percent
(e) 100 percent
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Textbook Question
List the factors involved in initiating labor contractions.
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Textbook Question
What hormonal events are responsible for puberty? Which life stage does puberty initiate?
Textbook Question
After implantation, how does the developing embryo obtain nutrients? What structures and processes are involved?
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Textbook Question
Distinguish between the following paired terms:
(b) heterozygous and homozygous,
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