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Question 1
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
50% (02:37) correct
50%
(02:52) wrong
based on 446
sessions
History
Date
Time
Result
Not Attempted Yet
Question 2
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
71% (00:51) correct 29%
(01:02) wrong
based on 415
sessions
History
Date
Time
Result
Not Attempted Yet
Question 3
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
53% (01:36) correct 47%
(01:29) wrong
based on 415
sessions
History
Date
Time
Result
Not Attempted Yet
Cartilage is a specialized connective tissue whose flexibility and resilience enable it to function as a shock absorber and provide a nearly friction-free environment for the movement of the body's joints. Since cartilage is not vascularized by blood vessels and is not supplied with nerves or lymphatic vessels, cartilage cells, called chondrocytes, receive nourishment from the blood vessels of surrounding connective tissues. Nutrients diffuse through the extracellular matrix secreted by the chondrocytes. Because this system is inefficient, cartilage growth is limited in width.
The extracellular matrix is also responsible for cartilage's resistance to mechanical stress. The alignment and orientation of fibers in the cartilage, as well as the density and composition of fibers in the matrix, determine the degree of elasticity of each type of cartilage. Hyaline cartilage, for example, whose dry weight contains up to 40% type II collagen fibers, is the most common and multifunctional type of cartilage. It is found in the trachea, larynx, ribs, and moveable joints. In contrast, the abundance of elastic fibers in elastic cartilage results in more pliability, hence elastic cartilage can be found in such organs as the epiglottis, a flap of cartilage which moves to cover the windpipe when swallowing. Finally, fibrocartilage's dense, coarse type I fibers allow it to withstand strong tensile forces in the vertebrae.
The extracellular matrix is also responsible for cartilage's resistance to mechanical stress. The alignment and orientation of fibers in the cartilage, as well as the density and composition of fibers in the matrix, determine the degree of elasticity of each type of cartilage. Hyaline cartilage, for example, whose dry weight contains up to 40% type II collagen fibers, is the most common and multifunctional type of cartilage. It is found in the trachea, larynx, ribs, and moveable joints. In contrast, the abundance of elastic fibers in elastic cartilage results in more pliability, hence elastic cartilage can be found in such organs as the epiglottis, a flap of cartilage which moves to cover the windpipe when swallowing. Finally, fibrocartilage's dense, coarse type I fibers allow it to withstand strong tensile forces in the vertebrae.
1. The purpose of this passage is to
A. demonstrate the relationship between cartilage cells and the extracellular matrix
B. explain cartilage's function as a shock absorber and provider of friction-free environments
C. describe the key components of cartilage and their function
D. prove that cartilage's extracellular matrix is both limiting and beneficial to chondrocytes
E. show how cartilage is a specialized connective tissue
A. demonstrate the relationship between cartilage cells and the extracellular matrix
B. explain cartilage's function as a shock absorber and provider of friction-free environments
C. describe the key components of cartilage and their function
D. prove that cartilage's extracellular matrix is both limiting and beneficial to chondrocytes
E. show how cartilage is a specialized connective tissue
2. The author mentions that cartilage is not vascularized by blood vessels in order to
A. explain why chondrocytes must get their nutrients from other sources
B. demonstrate that cartilage is specialized
C. show how cartilage is different from other connective tissues
D. give an example of the weakness of chondrocytes
E. provide evidence for cartilage's flexibility and resilience
A. explain why chondrocytes must get their nutrients from other sources
B. demonstrate that cartilage is specialized
C. show how cartilage is different from other connective tissues
D. give an example of the weakness of chondrocytes
E. provide evidence for cartilage's flexibility and resilience
3. Which of the following can be concluded about the extracellular matrix?
A. not all types of cartilage contain the same percentage of fibers in their composition
B. the density of fibers determines the resistance of cartilage to stress
C. the fibers realign themselves in response to mechanical stress
D. the extracellular matrix is produced by surrounding connective tissues
E. nothing besides nutrients is allowed to pass through the extracellular matrix
A. not all types of cartilage contain the same percentage of fibers in their composition
B. the density of fibers determines the resistance of cartilage to stress
C. the fibers realign themselves in response to mechanical stress
D. the extracellular matrix is produced by surrounding connective tissues
E. nothing besides nutrients is allowed to pass through the extracellular matrix
09 Nov 2021, 07:56
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3. Which of the following can be concluded about the extracellular matrix?
A. not all types of cartilage contain the same percentage of fibers in their composition
B. the density of fibers determines the resistance of cartilage to stress
C. the fibers realign themselves in response to mechanical stress
D. the extracellular matrix is produced by surrounding connective tissues
E. nothing besides nutrients is allowed to pass through the extracellular matrix[/box_in][/box_out][/align]
Isn't option A just talks about Cartilage and nothing specific about the Extracellular Matrix ?
A. not all types of cartilage contain the same percentage of fibers in their composition
B. the density of fibers determines the resistance of cartilage to stress
C. the fibers realign themselves in response to mechanical stress
D. the extracellular matrix is produced by surrounding connective tissues
E. nothing besides nutrients is allowed to pass through the extracellular matrix[/box_in][/box_out][/align]
Isn't option A just talks about Cartilage and nothing specific about the Extracellular Matrix ?
09 Nov 2021, 09:15
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Hello mukherjeeabhish
Answer Choice (A) seems like a reasonable conclusion because hyaline cartilage is mentioned as having 40% collagen fibers. This is followed by the fact that this is "in contrast (to) the abundance of elastic fibers in elastic cartilage." It must be true that not all types of cartilage contain the same percentage of fibers, and (A) is correct. However, another way to approach an inference question is to eliminate the choices that don't have to be correct based on the facts in the passage.
Answer: A
Answer Choice (A) seems like a reasonable conclusion because hyaline cartilage is mentioned as having 40% collagen fibers. This is followed by the fact that this is "in contrast (to) the abundance of elastic fibers in elastic cartilage." It must be true that not all types of cartilage contain the same percentage of fibers, and (A) is correct. However, another way to approach an inference question is to eliminate the choices that don't have to be correct based on the facts in the passage.
Answer: A
mukherjeeabhish
