Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Muscular arteries control blood flow at the tissue level.
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Ch. 18 The Cardiovascular System II: The Blood Vessels
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology24
- Ch. 2 The Chemistry of Life37
- Ch. 3 The Cell54
- Ch. 4 Histology46
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System35
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System41
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart28
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity41
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Not the one you use?Change textbook
Chapter 18, Problem L2.1b
A birth defect called transposition of great vessels results in the pulmonary trunk emanating from the left ventricle and the aorta stemming from the right ventricle.
Predict the potential effects of this birth defect.
Verified step by step guidance1
Understand the normal anatomy and physiology of the heart: In a healthy heart, the pulmonary trunk arises from the right ventricle and carries deoxygenated blood to the lungs for oxygenation, while the aorta arises from the left ventricle and carries oxygenated blood to the rest of the body.
Analyze the defect described: In transposition of the great vessels, the pulmonary trunk is connected to the left ventricle, and the aorta is connected to the right ventricle. This results in a reversal of the normal blood flow pathways.
Predict the consequences for oxygenation: Deoxygenated blood from the body would be pumped into the aorta by the right ventricle, bypassing the lungs entirely. Similarly, oxygenated blood from the lungs would be pumped into the pulmonary trunk by the left ventricle, returning to the lungs instead of being distributed to the body.
Consider the systemic effects: The body would receive insufficient oxygen, leading to hypoxia (low oxygen levels in tissues). This can result in symptoms such as cyanosis (bluish discoloration of the skin), difficulty breathing, and impaired organ function.
Discuss potential medical interventions: This condition typically requires surgical correction shortly after birth to restore normal blood flow pathways. Procedures such as the arterial switch operation are performed to connect the pulmonary trunk to the right ventricle and the aorta to the left ventricle.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Transposition of Great Vessels
Transposition of great vessels (TGV) is a congenital heart defect where the positions of the pulmonary artery and aorta are switched. This results in two separate circulatory systems: one that circulates oxygen-poor blood and another that circulates oxygen-rich blood, leading to inadequate oxygenation of the body. Understanding TGV is crucial for predicting its physiological effects and potential complications.
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Blood Vessels
Circulatory System Function
The circulatory system is responsible for transporting oxygen, nutrients, and waste products throughout the body. In a normal heart, oxygen-rich blood is delivered to the body while oxygen-poor blood is sent to the lungs for reoxygenation. In TGV, the disruption of this process can lead to severe hypoxia and organ dysfunction, making it essential to understand how blood flow is altered in this condition.
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Clinical Implications and Management
The clinical implications of transposition of great vessels include potential heart failure, cyanosis, and the need for surgical intervention. Management often involves procedures like balloon atrial septostomy or arterial switch surgery to correct the defect. Recognizing these implications is vital for predicting outcomes and planning appropriate treatment strategies for affected individuals.
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Related Practice
Textbook Question
Collagen vascular diseases weaken the collagen in the tunica externa of blood vessels. Predict the effects of such a disease.
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Textbook Question
Explain why a severed artery spurts blood, whereas a severed vein merely leaks blood.
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Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Veins have smaller lumens, more elastic fibers, and more smooth muscle than arteries.
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Textbook Question
Explain why a person who is 7 feet tall is likely to have higher blood pressure than a person whose height is 4 feet.
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Textbook Question
Locations where vessels connect via collateral vessels are known as:
a. Thoroughfare channels
b. Metarterioles
c. Anastomoses
d. Venules
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