Textbook Question
What is the homeostatic value of flexor reflexes?
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Ch. 13 The Peripheral Nervous System and Reflex Activity
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034
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Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units21
- Ch. 4 Tissue: The Living Fabric20
- Ch. 5 The Integumentary System11
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton14
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue19
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity32
- Ch. 14 The Autonomic Nervous System19
- Ch. 15 The Special Senses26
- Ch. 16 The Endocrine System23
- Ch. 17 Blood25
- Ch. 18 The Cardiovascular System: The Heart24
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues14
- 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
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Not the one you use?Change textbook
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Marieb, Hoehn 11th EditionCh. 13 The Peripheral Nervous System and Reflex ActivityProblem 26
Marieb, Hoehn 11th EditionCh. 13 The Peripheral Nervous System and Reflex ActivityProblem 26Chapter 13, Problem 26
Mr. Jake was admitted to the hospital with excruciating pain in his left shoulder and arm. He was found to have suffered a heart attack. Explain the phenomenon of referred pain as exhibited by Mr. Jake.
Verified step by step guidance1
Understand that referred pain occurs when pain originating from one part of the body is perceived in another area, often due to shared neural pathways.
Recognize that the heart and the left shoulder/arm share common spinal segments for sensory input, specifically the thoracic spinal nerves (T1-T5).
Explain that during a heart attack, pain signals from the heart travel along these spinal nerves to the spinal cord.
Because the brain is more accustomed to receiving sensory input from the skin and muscles of the left shoulder and arm at these spinal levels, it misinterprets the heart pain as coming from those areas.
Conclude that this neural overlap causes Mr. Jake to feel pain in his left shoulder and arm, even though the actual source is the heart.
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Referred Pain
Referred pain occurs when pain is perceived at a location other than the site of the painful stimulus. This happens because sensory nerves from different areas converge on the same spinal cord neurons, causing the brain to misinterpret the source of pain. In Mr. Jake's case, heart pain is felt in the left shoulder and arm.
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Visceral and Somatic Nerve Convergence
Visceral organs and somatic structures share common pathways in the spinal cord. Nerve fibers from the heart (visceral) and the left shoulder/arm (somatic) converge on the same spinal segments, leading to confusion in the brain about the pain's origin, which explains why heart pain is felt in the arm.
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Dermatomes and Pain Mapping
Dermatomes are skin areas supplied by specific spinal nerves. Understanding dermatomes helps explain referred pain patterns, as pain from internal organs is often felt in dermatomes linked to the same spinal segments. The left shoulder and arm dermatomes correspond to spinal segments that also receive heart sensory input.
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