Domanda del libro di testo
The biggest source of metabolic acids in the body is:
a. Lactic acid
b. Ketone bodies
c. Carbon dioxide
d. Uric acid
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Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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TOC.tableOfContents
- 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
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Non è quello che usi tu?Cambia libro di testo
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Amerman 2nd EditionCh. 25 Fluid, Electrolyte, and Acid-Base HomeostasisProblema 10c
Amerman 2nd EditionCh. 25 Fluid, Electrolyte, and Acid-Base HomeostasisProblema 10cCapitolo 25, Problema 10c
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
c. Hyperkalemia tends to decrease the resting membrane potential and hyperpolarize excitable cells.
Guida verificata passo dopo passo1
Understand the key terms in the statement: 'Hyperkalemia' refers to an elevated level of potassium ions (K⁺) in the blood, and 'resting membrane potential' is the electrical charge difference across the cell membrane when the cell is at rest.
Recall that the resting membrane potential is primarily maintained by the sodium-potassium pump and the relative permeability of the membrane to potassium ions. Potassium ions play a major role in determining the resting membrane potential because the membrane is more permeable to K⁺ than to other ions.
Analyze the effect of hyperkalemia: When extracellular K⁺ levels increase, the concentration gradient for K⁺ across the membrane decreases. This reduces the efflux (outward movement) of K⁺ from the cell, making the inside of the cell less negative (depolarized) rather than more negative (hyperpolarized).
Evaluate the statement: The claim that hyperkalemia 'decreases the resting membrane potential and hyperpolarizes excitable cells' is incorrect. Hyperkalemia actually decreases the resting membrane potential (makes it less negative) and depolarizes excitable cells, increasing their excitability.
Correct the statement: The corrected version of the statement should read, 'Hyperkalemia tends to decrease the resting membrane potential and depolarize excitable cells.'
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Hyperkalemia
Hyperkalemia refers to an elevated level of potassium in the blood. Potassium is crucial for maintaining the resting membrane potential of cells, particularly in excitable tissues like muscle and nerve cells. High potassium levels can disrupt normal cellular function, leading to various physiological effects.
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0:52
Renal Physiology Step 2: Tubular Reabsorption Example 6
Resting Membrane Potential
The resting membrane potential is the electrical potential difference across the cell membrane when a cell is not actively transmitting signals. It is primarily determined by the distribution of ions, especially sodium and potassium, across the membrane. A decrease in resting membrane potential can make cells more depolarized and less excitable.
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07:53Resting Membrane Potential
Hyperpolarization
Hyperpolarization is an increase in the membrane potential, making the inside of the cell more negative compared to the outside. This process makes it more difficult for a cell to reach the threshold for action potential generation, thus reducing excitability. In the context of hyperkalemia, the statement incorrectly suggests that hyperkalemia causes hyperpolarization, when it actually leads to depolarization.
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02:36Action Potentials Example 1
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