Textbook Question
Complete this map, which presents the three main topics of this chapter.
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Ch. 25 Control of Body Temperature and Water Balance
Taylor, Simon, Dickey, Hogan10th EditionCampbell Biology: Concepts & ConnectionsISBN: 9780136538783
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Table of contents
- Ch. 1 Biology: The Study of Scientific Life19
- Ch. 2 The Chemical Basis of Life17
- Ch. 3 The Molecules of Cells21
- Ch. 4 A Tour of the Cell20
- Ch. 5 The Working Cell17
- Ch. 6 How Cells Harvest Chemical Energy18
- Ch. 7 Photosynthesis: Using Light to Make Food15
- Ch. 8 The Cellular Basis of Reproduction and Inheritance22
- Ch. 9 Patterns of Inheritance17
- Ch. 10 Molecular Biology of the Gene13
- Ch. 11 How Genes Are Controlled13
- Ch. 12 DNA Technology and Genomics23
- Ch. 13 How Populations Evolve17
- Ch. 14 The Origin of Species19
- Ch. 15 Tracing Evolutionary History18
- Ch. 16 Microbial Life: Prokaryotes and Protists16
- Ch. 17 The Evolution of Plant and Fungal Diversity15
- Ch. 18 The Evolution of Invertebrate Diversity13
- Ch. 19 The Evolution of Vertebrate Diversity18
- Ch. 20 Unifying Concepts of Animal Structure and Function11
- Ch. 21 Nutrition and Digestion16
- Ch. 22 Gas Exchange16
- Ch. 23 Circulation17
- Ch. 24 The Immune System16
- Ch. 25 Control of Body Temperature and Water Balance20
- Ch. 26 Hormones and the Endocrine System10
- Ch. 27 Reproduction and Embryonic Development12
- Ch. 28 Nervous Systems10
- Ch. 29 The Senses12
- Ch. 30 How Animals Move19
- Ch. 31 Plant Structure, Growth, and Reproduction9
- Ch. 32 Plant Nutrition and Transport12
- Ch. 33 Control Systems in Plants15
- Ch. 34 The Biosphere: An Introduction to Earth's Diverse Environments15
- Ch. 35 Behavioral Adaptations to the Environment12
- Ch. 36 Population Ecology15
- Ch. 37 Communities and Ecosystems14
- Ch. 38 Conservation Biology14
Taylor, Simon, Dickey, Hogan10th EditionCampbell Biology: Concepts & ConnectionsISBN: 9780136538783Not the one you use?Change textbook
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Taylor, Simon, Dickey, Hogan 10th EditionCh. 25 Control of Body Temperature and Water BalanceProblem 2
Taylor, Simon, Dickey, Hogan 10th EditionCh. 25 Control of Body Temperature and Water BalanceProblem 2Chapter 25, Problem 2
In this schematic of urine production in a nephron, label the four processes involved and list some of the substances that are moved in each process. 
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Identify the four main processes involved in urine production: filtration, reabsorption, secretion, and excretion.
Label the process of filtration at the glomerulus, where blood pressure forces water and solutes out of the blood and into the Bowman's capsule.
Label the process of reabsorption in the tubule, where useful substances like glucose, amino acids, and ions are reabsorbed back into the blood from the filtrate.
Label the process of secretion in the tubule, where additional waste products and excess ions are secreted from the blood into the tubule.
Label the process of excretion in the collecting duct, where the final urine is collected and transported to the bladder for elimination from the body.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Filtration
Filtration is the first step in urine production, occurring in the glomerulus of the nephron. Blood pressure forces water, ions, and small molecules from the blood into the Bowman’s capsule, forming a filtrate. Larger molecules, such as proteins and blood cells, remain in the bloodstream. This process is crucial for removing waste products while retaining essential components.
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04:03
Filtration, Reabsorption, and Excretion
Reabsorption
Reabsorption takes place primarily in the renal tubules, where essential substances such as glucose, amino acids, and certain ions are selectively transported back into the bloodstream. This process ensures that valuable nutrients are not lost in urine. The reabsorption of water also occurs here, influenced by hormones like antidiuretic hormone (ADH), which helps maintain fluid balance.
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04:03Filtration, Reabsorption, and Excretion
Secretion
Secretion is the process by which additional waste products and excess ions are actively transported from the blood into the renal tubules. This occurs after filtration and reabsorption, allowing the body to eliminate substances like hydrogen ions, potassium, and certain drugs. Secretion plays a vital role in regulating blood pH and electrolyte balance, contributing to the overall homeostasis of the body.
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01:34Protein Secretion
Related Practice
Textbook Question
Which of the following is not an adaptation for reducing the rate of heat loss to the environment?
a. Feathers or fur
b. Increasing blood flow to surface blood vessels
c. Huddling behavior of penguins
d. Countercurrent heat exchange
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Textbook Question
In each nephron of the kidney, the glomerulus and Bowman's capsule
a. Filter the blood and capture the filtrate.
b. Reabsorb water into the blood.
c. Break down harmful toxins and poisons.
d. Refine and concentrate the urine for excretion.
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Textbook Question
As filtrate passes through the loop of Henle, salt is reabsorbed and concentrated in the interstitial fluid of the medulla. This high solute concentration in the medulla enables nephrons to
a. Excrete the maximum amount of salt.
b. Neutralize toxins that might be found in the kidney.
c. Excrete a large amount of water.
d. Reabsorb water from the filtrate very efficiently.
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