Textbook Question
Write a single sentence, using no more than 25 words, to summarize the following cellular processes:
Transcription
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Ch. 3 The Cell
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 3, Problem L3.B5b
Epithelial cells of the kidneys have pumps that drive the transcellular transport of sodium ions.
The movement of sodium ions drives the transcellular transport of water. Explain why water follows sodium. (Connects to Chapter 3)
Verified step by step guidance1
Understand the concept of osmosis: Osmosis is the movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. This principle is key to understanding why water follows sodium ions.
Recognize the role of sodium ions in creating a concentration gradient: Sodium ions are actively transported out of the epithelial cells of the kidneys into the interstitial fluid using sodium-potassium pumps. This creates a higher concentration of sodium ions in the interstitial fluid compared to the inside of the cells.
Explain how the concentration gradient affects water movement: The higher concentration of sodium ions in the interstitial fluid creates a hypertonic environment. Water moves from areas of lower solute concentration (inside the cells) to areas of higher solute concentration (interstitial fluid) to balance the osmotic pressure.
Connect the process to transcellular transport: The movement of sodium ions out of the epithelial cells drives the transcellular transport of water because water follows the osmotic gradient created by the sodium ion pumps.
Relate this mechanism to kidney function: This process is essential for the kidneys to regulate water and electrolyte balance in the body, ensuring proper hydration and maintaining homeostasis.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Osmosis
Osmosis is the passive movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. In the context of kidney epithelial cells, when sodium ions are actively transported out of the cells, it creates a higher concentration of solutes outside the cell, prompting water to follow sodium to balance the solute concentrations.
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05:59
Osmosis
Active Transport
Active transport is the process by which cells move ions or molecules against their concentration gradient, requiring energy, typically in the form of ATP. In the kidneys, sodium ions are actively pumped out of epithelial cells, which is crucial for maintaining electrolyte balance and facilitating the subsequent movement of water.
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02:37Active Transport
Transcellular Transport
Transcellular transport refers to the movement of substances across the epithelial cells, involving both passive and active mechanisms. In the kidneys, sodium ions are transported transcellularly, and this movement is essential for driving water reabsorption, as water follows sodium through osmosis, thereby influencing fluid balance in the body.
Recommended video:
02:37Active Transport
Related Practice
Textbook Question
A popular science fiction program once had an episode that featured an 'intron virus' that 'turned on' the introns in the genes, causing the synthesis of abnormal proteins. The episode may have been entertaining, but its premise had a large flaw about the nature of introns. What was the flaw?
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Textbook Question
What effect would the hypothetical poison of question 3 have on other functions of the cell? Explain.
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Textbook Question
What are the two fluid compartments in the body, and how are they kept separate?
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Textbook Question
Explain how the form of each of the following structures is related to its function:
Intermediate filaments
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Textbook Question
Write a single sentence, using no more than 25 words, to summarize each of the following cellular processes:
Mitosis