Textbook Question
Cary hyperventilates for several minutes before diving into a swimming pool. After he enters and begins swimming underwater, he blacks out and almost drowns. What caused this to happen?
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Ch. 23 The Respiratory System
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
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Table of contents
- Ch. 1 An Introduction to Anatomy and Physiology26
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization30
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure36
- 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 Senses16
- Ch. 18 The Endocrine System20
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation29
- Ch. 22 The Lymphatic System and Immunity31
- Ch. 23 The Respiratory System12
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes32
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance23
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Not the one you use?Change textbook
Chapter 23, Problem 29
Why do individuals who are anemic generally not exhibit an increase in respiratory rate or tidal volume, even though their blood is not carrying enough oxygen?
Verified step by step guidance1
Understand the concept of anemia: Anemia is a condition where the blood has a reduced capacity to carry oxygen, often due to a decrease in the number of red blood cells or hemoglobin levels. This leads to less oxygen being delivered to tissues.
Recognize the role of chemoreceptors: Chemoreceptors in the body, such as those in the carotid and aortic bodies, monitor levels of carbon dioxide (CO2), oxygen (O2), and pH in the blood. They primarily respond to changes in CO2 levels and pH rather than oxygen levels alone.
Explain why respiratory rate and tidal volume are regulated: The respiratory system adjusts breathing rate and tidal volume primarily in response to elevated CO2 levels (hypercapnia) or decreased pH (acidosis). In anemia, oxygen levels are reduced, but CO2 levels and pH may remain normal, so the respiratory system does not perceive a need to increase breathing.
Discuss oxygen delivery mechanisms: The body compensates for anemia by increasing cardiac output (heart rate and stroke volume) to deliver more oxygen to tissues, rather than relying on changes in respiratory rate or tidal volume.
Summarize the physiological response: Since the respiratory system is not directly triggered by low oxygen levels in anemia, individuals with anemia typically do not exhibit increased respiratory rate or tidal volume unless CO2 levels or pH are affected.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Anemia
Anemia is a condition characterized by a deficiency of red blood cells or hemoglobin, leading to reduced oxygen transport in the bloodstream. Individuals with anemia may experience fatigue and weakness due to insufficient oxygen delivery to tissues. However, the body often compensates for this deficiency through various mechanisms, which can influence respiratory responses.
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Respiratory Rate and Tidal Volume
Respiratory rate refers to the number of breaths taken per minute, while tidal volume is the amount of air inhaled or exhaled in a single breath. In healthy individuals, an increase in carbon dioxide levels or a decrease in oxygen levels typically triggers an increase in both respiratory rate and tidal volume. However, in anemic individuals, the body may not respond in the same way due to altered chemoreceptor sensitivity or compensatory mechanisms.
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Chemoreceptor Response
Chemoreceptors are specialized cells that detect changes in blood chemistry, particularly levels of carbon dioxide and oxygen. In normal physiology, a drop in oxygen or a rise in carbon dioxide stimulates an increase in breathing rate. In anemic patients, the body may not exhibit the same respiratory response due to the chronic nature of anemia, which can lead to adaptations in chemoreceptor sensitivity and a reliance on other compensatory mechanisms.
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Related Practice
Textbook Question
What are the differences between pulmonary volumes and respiratory capacities? How are pulmonary volumes and respiratory capacities determined?
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Textbook Question
What happens to the process of respiration when a person is sneezing or coughing?
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Textbook Question
Doris has an obstruction of her right primary bronchus. As a result, how would the oxygen–hemoglobin saturation curve for her right lung compare with that for her left?
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