Cartilage Flashcards
- The molecular basis for the shock absorbing properties of cartilage
involves which of the following?
a. Electrostatic interaction of proteoglycans with type IV collagen
b. Ability of glycosaminoglycans to bind anions
c. Noncovalent binding of glycosaminoglycans to protein cores
d. Sialic acid residues in the glycoproteins
e. Hydration of glycosaminoglycans
e. Hydration of glycosaminoglycans
- What distinguishes cartilage from most other connective tissues?
a. Its extracellular matrix is rich in collagen.
b. Its predominant cell type is a mesenchymal derivative.
c. Its predominant cell type secretes both fibers and proteoglycans.
d. It lacks blood vessels.
e. It functions in mechanical support.
d. It lacks blood vessels.
- Which feature is typical of elastic cartilage?
a. Primary skeletal tissue in the fetus
b. No identifiable perichondrium
c. Found in intervertebral discs
d. Most widely distributed cartilage type in the body
e. Collagen is mainly type II
e. Collagen is mainly type II
- Which area in cartilage is relatively collagen-poor and
proteoglycan-rich?
a. Fibrocartilage
b. Territorial matrix
c. Epiphyseal plate
d. Interterritorial matrix
e. Perichondrium
b. Territorial matrix
- What is the source of the mesenchymal progenitor cells activated for the repair of hyaline cartilage of accident-damaged costal cartilages?
a. Perichondrium
b. Adjacent loose connective tissue
c. Bone of the adjacent rib(s) and sternum
d. Chondrocytes of the injured cartilage
e. Stem cells circulating with blood
a. Perichondrium
- How does articular cartilage differ from most other hyaline
cartilage?
a. It undergoes mainly appositional growth.
b. It contains isogenous groups of chondrocytes.
c. It lacks a perichondrium.
d. Its matrix contains aggrecan.
e. It is derived from embryonic mesenchyme
c. It lacks a perichondrium.
- Which step occurs first in chondrogenesis?
a. Appositional growth
b. Conversion of chondroblasts to chondrocytes
c. Formation of mesenchymal condensations
d. Interstitial growth
e. Secretion of collagen-rich and proteoglycan-rich matrix
c. Formation of mesenchymal condensations
- Osteoarthritis is characterized by the progressive erosion of articular cartilage. The matrix metalloproteinases involved in this erosion primarily act on which matrix component?
a. Aggrecan
b. Link proteins
c. Network-forming collagen
d. Fibril-forming collagen
e. Chondronectin
d. Fibril-forming collagen
- A 28-year-old woman visits the family medicine clinic complaining of loss of the sense of smell, nosebleeds, problems with swallowing, and hoarseness. She admits to “casual, social use” of cocaine on a regular basis since her sophomore year of college. A complete examination of her nose with a speculum and otoscope shows severe rhinitis (inflammation). There is also perforation and collapse of the nasal cartilage resulting in a “saddle nose” deformity. Erosions in the enamel of her front teeth are noted. The breakdown of the nasal cartilage releases collagen fibers primarily of which type?
a. Type I
b. Type II
c. Type III
d. Type IV
e. Type VII
b. Type II
- A 66-year-old man who suffered from severe osteoarthritis is referred to an orthopedic surgeon for replacement of his right knee. He had been actively involved in both high school and intercollegiate football and had continued running until about the age of 45 as a form of relaxation and exercise. With the patient’s permission the removed joint is used by investigators performing a proteomic analysis of different joint tissues. The meniscus was found to contain almost exclusively type I collagen and aggrecan was undetectable. What is the most likely explanation for this result?
a. The meniscus normally consists of dense regular connective tissue, which contains primarily type I collagen.
b. The meniscus normally consists of fibrocartilage, which contains only type I collagen.
c. The meniscus had undergone repeated rounds of repair due to wear-and-tear during which its hyaline cartilage component was replaced by dense connective tissue.
d. Osteoarthritic injury in the knee resulted in the chondrocytes of the meniscus switching from expression of genes for type II collagen to type I collagen.
e. Elastic cartilage is normally replaced by fibrocartilage during aging and this process can be accelerated by exercise.
c. The meniscus had undergone repeated rounds of repair due to wear-and-tear during which its hyaline cartilage component was replaced by dense connective tissue.
