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All of the following contribute to increases intracranial pressure EXCEPT: O Brain tissue O CSF Volume O Skull circumference O Cerebral blood volume

All of the following contribute to increases intracranial pressure EXCEPT: O Brain tissue O CSF Volume O Skull circumference O Cerebral blood volume

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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### Understanding Factors Contributing to Intracranial Pressure Intracranial pressure (ICP) refers to the pressure inside the skull and thus in the brain tissue and cerebrospinal fluid (CSF). Several factors influence the level of intracranial pressure, and it is important to identify these factors to comprehend the mechanisms that can lead to increased ICP. Below is a question designed to test the understanding of these contributing factors. **Question:** All of the following contribute to increases in intracranial pressure EXCEPT: - ( ) Brain tissue - ( ) CSF Volume - ( ) Skull circumference - ( ) Cerebral blood volume ### Explanation of Factors: 1. **Brain Tissue**: - Brain tissue refers to the actual physical substance of the brain. An increase in brain tissue volume, due to swelling (edema) or tumors, contributes to increased intracranial pressure. 2. **CSF Volume**: - CSF or cerebrospinal fluid surrounds the brain and spinal cord, providing cushioning and support. An increase in CSF volume, as might occur with hydrocephalus, directly raises intracranial pressure. 3. **Skull Circumference**: - Skull circumference is the measurement around the head. Unlike the brain tissue, CSF volume, and cerebral blood volume, the skull is a rigid structure in adults. Therefore, an increase in skull circumference generally does not occur in adults and does not directly contribute to intracranial pressure in the context of this question. 4. **Cerebral Blood Volume**: - Cerebral blood volume refers to the amount of blood in the brain at any one time. Increases in cerebral blood due to factors like vasodilation or venous obstruction can increase intracranial pressure. ### Answer Explanation The correct choice for the question is "Skull circumference" as it does not contribute to an increase in intracranial pressure. This is because the adult skull is a fixed, rigid structure and does not expand or increase in circumference under normal physiological conditions. Acting as a protective container for the brain, changes in intracranial pressure are more closely related to changes in brain tissue, CSF volume, and blood volume within the cranial vault.
Transcribed Image Text:### Understanding Factors Contributing to Intracranial Pressure Intracranial pressure (ICP) refers to the pressure inside the skull and thus in the brain tissue and cerebrospinal fluid (CSF). Several factors influence the level of intracranial pressure, and it is important to identify these factors to comprehend the mechanisms that can lead to increased ICP. Below is a question designed to test the understanding of these contributing factors. **Question:** All of the following contribute to increases in intracranial pressure EXCEPT: - ( ) Brain tissue - ( ) CSF Volume - ( ) Skull circumference - ( ) Cerebral blood volume ### Explanation of Factors: 1. **Brain Tissue**: - Brain tissue refers to the actual physical substance of the brain. An increase in brain tissue volume, due to swelling (edema) or tumors, contributes to increased intracranial pressure. 2. **CSF Volume**: - CSF or cerebrospinal fluid surrounds the brain and spinal cord, providing cushioning and support. An increase in CSF volume, as might occur with hydrocephalus, directly raises intracranial pressure. 3. **Skull Circumference**: - Skull circumference is the measurement around the head. Unlike the brain tissue, CSF volume, and cerebral blood volume, the skull is a rigid structure in adults. Therefore, an increase in skull circumference generally does not occur in adults and does not directly contribute to intracranial pressure in the context of this question. 4. **Cerebral Blood Volume**: - Cerebral blood volume refers to the amount of blood in the brain at any one time. Increases in cerebral blood due to factors like vasodilation or venous obstruction can increase intracranial pressure. ### Answer Explanation The correct choice for the question is "Skull circumference" as it does not contribute to an increase in intracranial pressure. This is because the adult skull is a fixed, rigid structure and does not expand or increase in circumference under normal physiological conditions. Acting as a protective container for the brain, changes in intracranial pressure are more closely related to changes in brain tissue, CSF volume, and blood volume within the cranial vault.
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