Textbook Question
Describe the appearance of platelets and state their major function
Why should platelets not be called 'cells'?
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Ch. 17 Blood
Hoehn, Haynes, Abbott12th EditionMarieb Human Anatomy & PhysiologyISBN: 9780138242732
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Table of contents
- Ch. 1 The Human Body: An Orientation25
- Ch. 2 Chemistry Comes Alive24
- Ch. 3 Cells: The Living Units24
- Ch. 4 Tissue: The Living Fabric19
- Ch. 5 The Integumentary System12
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton14
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System25
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue23
- Ch. 12 The Central Nervous System25
- Ch. 13 The Peripheral Nervous System and Reflex Activity30
- Ch. 14 The Autonomic Nervous System16
- Ch. 15 The Special Senses26
- Ch. 16 The Endocrine System26
- Ch. 17 Blood27
- Ch. 18 The Cardiovascular System: The Heart25
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues16
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses27
- Ch. 22 The Respiratory System21
- Ch. 23 The Digestive System31
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System26
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System24
- Ch. 28 Pregnancy and Human Development25
- Ch. 29 Heredity11
Hoehn, Haynes, Abbott12th EditionMarieb Human Anatomy & PhysiologyISBN: 9780138242732Not the one you use?Change textbook
Chapter 17, Problem 19
How is clot overgrowth usually prevented?
List two conditions that may lead to unnecessary (and undesirable) clot formation.
Verified step by step guidance1
Understand that clot overgrowth is usually prevented by natural anticoagulant mechanisms in the body that regulate clot formation and dissolution to maintain blood flow and prevent excessive clotting.
Recognize that one key mechanism involves the release of substances like prostacyclin and nitric oxide from endothelial cells, which inhibit platelet aggregation and vasodilate blood vessels, reducing clot formation.
Another important factor is the presence of anticoagulant proteins such as antithrombin III and activated protein C, which inactivate clotting factors and limit the clotting cascade.
For the second part, identify conditions that can lead to unnecessary clot formation, such as endothelial injury (damage to the blood vessel lining) which exposes collagen and triggers clotting.
Also consider conditions like stasis of blood flow (slow or turbulent blood flow), which can promote clot formation by allowing platelets and clotting factors to accumulate and activate.
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Key Concepts
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Mechanisms Preventing Clot Overgrowth
Clot overgrowth is typically prevented by natural anticoagulant systems such as antithrombin, protein C and S pathways, and fibrinolysis. These mechanisms regulate clot size by inhibiting excessive thrombin generation and breaking down fibrin, ensuring clots remain localized and do not obstruct normal blood flow.
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Coagulation (Blood Clotting)
Pathophysiology of Thrombosis
Thrombosis occurs when clots form inappropriately within blood vessels, disrupting normal circulation. It involves an imbalance between procoagulant and anticoagulant factors, often triggered by endothelial injury, abnormal blood flow, or hypercoagulability, leading to pathological clot formation.
Conditions Leading to Unnecessary Clot Formation
Two common conditions that promote unwanted clotting are atherosclerosis, where damaged vessel walls trigger clotting, and atrial fibrillation, which causes blood stasis in the heart. Both increase the risk of thrombosis by creating environments conducive to clot initiation and growth.
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Related Practice
Textbook Question
Define fibrinolysis
What is the importance of this process?
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Textbook Question
Alan Forsythe, a middle-aged college professor from Boston, is in the Swiss Alps studying astronomy during his sabbatical leave. He has been there for two days and plans to stay the entire year. However, he notices that he is short of breath when he walks up steps and tires easily with any physical activity. His symptoms gradually disappear, and he feels fine after less than a month. Upon returning to the United States, he has a complete physical exam and is told that his erythrocyte count is higher than normal.
a. Attempt to explain this finding.
b. Will his RBC count remain at this higher-than-normal level? Why or why not?
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Textbook Question
If you had a severe infection, would you expect your WBC count to be closest to 5000, 10,000, or 15,000/μl?
What is this condition called?
Textbook Question
How can poor nutrition lead to anemia?
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Textbook Question
Discuss hemoglobin relative to its chemical structure, its function, and the color changes it undergoes during loading and unloading of oxygen.
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