Textbook Question
Hypothalamic releasing and inhibiting hormones are released into the _____ system and affect secretion from the _____ gland.
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Ch. 16 The Endocrine System
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology26
- Ch. 2 The Chemistry of Life38
- Ch. 3 The Cell55
- Ch. 4 Histology47
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System36
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System42
- 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 Heart30
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity45
- 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
Chapter 16, Problem 4
How does ADH affect the amount of water in the body, and how does it accomplish this? How does this affect the osmolarity of the blood?
Verified step by step guidance1
Understand the role of ADH (antidiuretic hormone): ADH is a hormone secreted by the posterior pituitary gland that helps regulate water balance in the body by acting on the kidneys.
Explain the mechanism of ADH action: ADH binds to receptors on the cells of the collecting ducts in the kidneys, triggering the insertion of aquaporin-2 water channels into the cell membranes. This increases the permeability of the collecting ducts to water.
Describe the effect on water reabsorption: With more aquaporin-2 channels present, water is reabsorbed from the filtrate in the collecting ducts back into the bloodstream, reducing the amount of water excreted in urine and increasing the total water content in the body.
Discuss the impact on blood osmolarity: By increasing water reabsorption, ADH dilutes the solutes in the blood, thereby decreasing blood osmolarity (the concentration of solutes in the blood).
Summarize the feedback mechanism: ADH secretion is regulated by osmoreceptors in the hypothalamus. When blood osmolarity is high, ADH secretion increases to conserve water and restore osmolarity to normal levels. Conversely, when blood osmolarity is low, ADH secretion decreases to allow more water to be excreted.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Antidiuretic Hormone (ADH)
Antidiuretic Hormone, also known as vasopressin, is a peptide hormone produced by the hypothalamus and released by the posterior pituitary gland. Its primary function is to regulate water balance in the body by promoting water reabsorption in the kidneys, specifically in the collecting ducts. This action helps to concentrate urine and reduce water loss, thereby maintaining hydration and blood volume.
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Review of Major Hormones
Osmolarity
Osmolarity refers to the concentration of solutes in a solution, which affects the movement of water across cell membranes. In the context of blood, osmolarity is crucial for maintaining fluid balance and proper physiological function. When ADH increases water reabsorption, it dilutes the solute concentration in the blood, thereby lowering osmolarity and helping to prevent dehydration.
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07:59Osmosis and Osmolarity
Kidney Function in Water Regulation
The kidneys play a vital role in regulating water balance through processes such as filtration, reabsorption, and secretion. When ADH is present, it enhances the permeability of the kidney's collecting ducts, allowing more water to be reabsorbed back into the bloodstream. This mechanism not only conserves water but also influences blood pressure and osmolarity, ensuring homeostasis within the body.
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1:00The Kidneys Example 1
Related Practice
Textbook Question
Let's say that the dietary supplement in question 2 actually works and successfully blocks cortisol secretion. Could this drug potentially be harmful? Predict its effects on overall homeostasis.
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Textbook Question
A new diet guru claims hypersecretion of cortisol is the reason why so many people are obese. He is marketing a dietary supplement that is supposedly able to block cortisol secretion and lead to weight loss. How would cortisol hypersecretion cause weight gain? Would blocking normal cortisol secretion lead to weight loss? Why or why not?
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Textbook Question
Which of the following correctly describes the functions of the endocrine system?
a. Transport of blood through the body and through the lungs
b. Regulation of body functions through hormone secretion
c. Regulation of body functions through nerve impulses
d. Immunity and returning extra tissue fluid to the blood vessels
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Textbook Question
List the target tissues and effects of the following anterior pituitary gland hormones.
a. Thyroid-stimulating hormone
b. Adrenocorticotropic hormone
c. Prolactin
d. Gonadotropins
e. Growth hormone
Textbook Question
What has likely happened to the pH of Mr. Montez's blood? What does this mean about the hydrogen ion concentration in his blood? How will his buffer systems respond to this change in pH?
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