Why do elevations of K in the blood have serious physiological consequences despite the blood-brain barrier and spatial buffering? + O a. The blood-brain barrier and spatial buffering protect against increases in Na* not K O b. Muscle cells are not protected from increases in potassium O c. The blood-brain barrier and spatial buffering can be overwhelmed by a tenfold increase in extracellular potassium O d. Astrocytes do not protect the axons from increases in potassium
Why do elevations of K in the blood have serious physiological consequences despite the blood-brain barrier and spatial buffering? + O a. The blood-brain barrier and spatial buffering protect against increases in Na* not K O b. Muscle cells are not protected from increases in potassium O c. The blood-brain barrier and spatial buffering can be overwhelmed by a tenfold increase in extracellular potassium O d. Astrocytes do not protect the axons from increases in potassium
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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![### Physiological Consequences of Potassium Elevation in Blood
**QUESTION 7**
Why do elevations of \( K^+ \) in the blood have serious physiological consequences despite the blood-brain barrier and spatial buffering?
- a. The blood-brain barrier and spatial buffering protect against increases in \( Na^+ \) not \( K^+ \)
- b. Muscle cells are not protected from increases in potassium
- c. The blood-brain barrier and spatial buffering can be overwhelmed by a tenfold increase in extracellular potassium
- d. Astrocytes do not protect the axons from increases in potassium
**QUESTION 8**
Which of the following mechanisms decrease intracellular \( [Ca^{2+}] \)?
- a. The calcium pump
- b. Intracellular calcium-binding proteins
- c. Organelles that sequester cytosolic calcium ions
- d. All of the above
**Instructions**: Click "Save and Submit" to save and submit. Click "Save All Answers" to save all answers.
---
### Detailed Image Description
The image depicts a page displaying an online educational quiz. The questions focus on physiology, specifically related to ion concentration and mechanisms of ion regulation.
Above the questions, there is a banner (possibly indicating the question section or quiz title), followed by two multiple-choice questions. The first question (Question 7) is about the physiological consequences of elevated potassium levels in the blood. The second question (Question 8) is focused on the mechanisms that decrease intracellular calcium levels.
Below these questions is a prompt for saving and submitting answers.
### Device Context
The curved edge and partially visible keyboard indicate that the quiz is being viewed on a laptop. The presence of icons at the bottom of the screen suggests that the operating system is Windows, and the browser has multiple tabs open. The image shows a portion of the keyboard with keys corresponding to letters, numbers, and symbols.
---
This educational content is part of an online quiz designed to test students' understanding of cellular physiology, particularly the roles of potassium and calcium ions.
### Key Concepts:
- The importance of ion concentration regulation in physiological processes.
- The role of biological barriers like the blood-brain barrier.
- The protective mechanisms employed by cells and organelles to maintain homeostasis.
For further information about these topics and detailed explanations, refer to the lecture notes and recommended readings.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc2b834c9-97c8-4f18-8ce1-0b242c8acfdf%2F1f22e0cd-69b9-47ab-a665-83bb7e331e26%2Fba65chri_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Physiological Consequences of Potassium Elevation in Blood
**QUESTION 7**
Why do elevations of \( K^+ \) in the blood have serious physiological consequences despite the blood-brain barrier and spatial buffering?
- a. The blood-brain barrier and spatial buffering protect against increases in \( Na^+ \) not \( K^+ \)
- b. Muscle cells are not protected from increases in potassium
- c. The blood-brain barrier and spatial buffering can be overwhelmed by a tenfold increase in extracellular potassium
- d. Astrocytes do not protect the axons from increases in potassium
**QUESTION 8**
Which of the following mechanisms decrease intracellular \( [Ca^{2+}] \)?
- a. The calcium pump
- b. Intracellular calcium-binding proteins
- c. Organelles that sequester cytosolic calcium ions
- d. All of the above
**Instructions**: Click "Save and Submit" to save and submit. Click "Save All Answers" to save all answers.
---
### Detailed Image Description
The image depicts a page displaying an online educational quiz. The questions focus on physiology, specifically related to ion concentration and mechanisms of ion regulation.
Above the questions, there is a banner (possibly indicating the question section or quiz title), followed by two multiple-choice questions. The first question (Question 7) is about the physiological consequences of elevated potassium levels in the blood. The second question (Question 8) is focused on the mechanisms that decrease intracellular calcium levels.
Below these questions is a prompt for saving and submitting answers.
### Device Context
The curved edge and partially visible keyboard indicate that the quiz is being viewed on a laptop. The presence of icons at the bottom of the screen suggests that the operating system is Windows, and the browser has multiple tabs open. The image shows a portion of the keyboard with keys corresponding to letters, numbers, and symbols.
---
This educational content is part of an online quiz designed to test students' understanding of cellular physiology, particularly the roles of potassium and calcium ions.
### Key Concepts:
- The importance of ion concentration regulation in physiological processes.
- The role of biological barriers like the blood-brain barrier.
- The protective mechanisms employed by cells and organelles to maintain homeostasis.
For further information about these topics and detailed explanations, refer to the lecture notes and recommended readings.
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