#1
Which type of cartilage is most commonly found in the human body?
Hyaline cartilage
ExplanationMost prevalent type of cartilage, found in joints, ribs, nose, and respiratory passages.
#2
Which of the following is characteristic of articular cartilage?
It lacks blood vessels and nerves
ExplanationFeature of cartilage at joints; avascular and aneural, relying on diffusion for nutrients.
#3
What is the primary component of the extracellular matrix in hyaline cartilage?
Collagen type II
ExplanationMain structural protein forming the matrix of hyaline cartilage.
#4
Which of the following is NOT a factor affecting cartilage growth?
Temperature
ExplanationTemperature doesn't significantly influence cartilage growth.
#5
Which of the following is a function of chondrocytes in cartilage?
Producing extracellular matrix components
ExplanationChondrocytes actively synthesize and maintain the cartilage matrix.
#6
What type of cartilage is present at the articulating surfaces of bones in synovial joints?
Articular cartilage
ExplanationSmooth, low-friction cartilage covering joint surfaces, facilitating movement.
#7
What is the process by which chondrocytes become trapped within lacunae and secrete extracellular matrix around themselves?
Chondrocyte differentiation
ExplanationMaturation process where chondrocytes entrench themselves in lacunae and produce matrix.
#8
Which of the following is a characteristic feature of fibrocartilage?
Rich in proteoglycans
ExplanationType of cartilage with high proteoglycan content, enhancing its shock-absorbing properties.
#9
During which stage of cartilage growth do chondrocytes undergo rapid cell division?
Proliferation stage
ExplanationPhase of cartilage growth characterized by active chondrocyte replication.
#10
Which hormone plays a crucial role in regulating cartilage growth?
Growth hormone
ExplanationHormone vital for stimulating growth and development of cartilage and bones.
#11
Which of the following is NOT a function of cartilage in the body?
Storing fat for energy
ExplanationCartilage doesn't serve as an energy storage site; it's primarily for support and flexibility.
#12
What is the term for the process by which chondrocytes produce and maintain the extracellular matrix of cartilage?
Chondrogenesis
ExplanationFormation and maintenance of cartilage matrix by chondrocytes.
#13
Which type of cartilage is found in the external ear and epiglottis?
Elastic cartilage
ExplanationHighly flexible type of cartilage, providing support and elasticity in structures like ears.
#14
What is the primary function of fibrocartilage?
Absorbing shock in the vertebral column
ExplanationType of cartilage found in intervertebral discs, resilient to compressive forces.
#15
Which zone of the growth plate contains the resting chondrocytes?
Zone of reserve cartilage
ExplanationRegion of growth plate housing inactive chondrocytes before differentiation.
#16
What is the term for the process by which cartilage is replaced by bone during skeletal development?
Endochondral ossification
ExplanationMechanism of bone formation from cartilage templates during embryonic development.
#17
Which vitamin is essential for the synthesis of collagen, an important component of cartilage?
Vitamin C
ExplanationCrucial nutrient for collagen production, supporting cartilage structure.
#18
Which growth factor is crucial for the differentiation of mesenchymal cells into chondrocytes?
Bone morphogenetic protein (BMP)
ExplanationInduces mesenchymal cells to differentiate into chondrocytes during cartilage formation.
#19
What is the name of the process by which cartilage grows in thickness?
Appositional growth
ExplanationIncrease in cartilage thickness by the addition of new layers on the surface.
#20
Which of the following factors can negatively impact cartilage health and growth?
Obesity
ExplanationExcessive body weight increases mechanical stress on cartilage, leading to degradation.
#21
What type of cartilage is present in the intervertebral discs?
Fibrocartilage
ExplanationType of cartilage providing strength and flexibility to intervertebral discs.
#22
Which of the following hormones can inhibit cartilage growth when present in excessive amounts?
Thyroid hormone
ExplanationExcessive thyroid hormone levels can hinder cartilage development and growth.
#23
What type of cartilage forms the template for endochondral bone formation in long bones during fetal development?
Hyaline cartilage
ExplanationCartilage type serving as a scaffold for bone formation in embryonic long bones.
#24
Which enzyme is primarily responsible for the degradation of cartilage matrix?
MMPs (Matrix Metalloproteinases)
ExplanationEnzymes that break down cartilage components, crucial in tissue remodeling and repair.
#25
Which growth factor is involved in stimulating chondrocyte proliferation and differentiation?
Transforming Growth Factor Beta (TGF-β)
ExplanationKey factor regulating cell growth and differentiation in cartilage development.