Textbook Question
What do you think has happened to Elise's ECF volume and osmolarity over the past 3 days? Will this lead to a change in the volume of water in the cytosol of her cells? Explain.
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Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis
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 25, Problem 6a
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
a. The thirst mechanism is mediated by osmoreceptors located in the cerebral cortex.
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Understand the statement: The problem asks whether the thirst mechanism is mediated by osmoreceptors located in the cerebral cortex. Begin by identifying the key terms: 'thirst mechanism,' 'osmoreceptors,' and 'cerebral cortex.'
Recall the role of osmoreceptors: Osmoreceptors are specialized cells that detect changes in the osmolarity (concentration of solutes) of body fluids. They play a critical role in regulating water balance and triggering the thirst mechanism.
Identify the location of osmoreceptors: Osmoreceptors are primarily located in the hypothalamus, not the cerebral cortex. The hypothalamus is a region of the brain responsible for maintaining homeostasis, including thirst regulation.
Evaluate the statement: Since osmoreceptors are located in the hypothalamus and not the cerebral cortex, the statement is false.
Correct the false statement: The corrected statement should read, 'The thirst mechanism is mediated by osmoreceptors located in the hypothalamus.'
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Thirst Mechanism
The thirst mechanism is a physiological response that regulates fluid balance in the body. It is primarily triggered by dehydration or increased osmolarity of the blood, prompting the sensation of thirst to encourage fluid intake. This mechanism is crucial for maintaining homeostasis and preventing dehydration.
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Osmoreceptors
Osmoreceptors are specialized neurons that detect changes in the osmotic pressure of body fluids. They are primarily located in the hypothalamus, not the cerebral cortex, and play a key role in regulating thirst and the release of antidiuretic hormone (ADH). When osmolarity increases, osmoreceptors stimulate thirst to restore fluid balance.
Cerebral Cortex
The cerebral cortex is the outer layer of the brain responsible for higher brain functions, including sensory perception, cognition, and voluntary motor actions. While it plays a role in the conscious perception of thirst, the actual regulation of thirst is primarily controlled by the hypothalamus, where osmoreceptors are located.
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Related Practice
Textbook Question
As a percentage of body weight, the total body water tends to be higher in ________ and lower in ________ .
a. infants; men
b. women; men
c. men; infants
d. infants; women
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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.
d. Atrial natriuretic peptide promotes water retention in the kidneys and increases the amount of water in the body.
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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.
b. The sensible water loss includes the water lost from the body via the skin and the respiratory system.
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Textbook Question
A cell in a/an ________ fluid will lose water, and a cell in a/an ________ fluid will gain water.
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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.
c. The main hormone that regulates fluid balance is antidiuretic hormone (ADH).
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