Proximal epiphysis Red bone marrow Yellow bone marrow 9 The epiphyseal line is a
ID: 3507009 • Letter: P
Question
Proximal epiphysis Red bone marrow Yellow bone marrow 9 The epiphyseal line is a. the structure from which long bones grow in length. b. a remnant of the structure from which long bones grow FIG in length. c. composed of hyaline cartilage. d. found lining the surface of the epiphysis. 10 In the zone of ossification of the epiphyseal plate a. chondrocytes are actively dividing. b. chondrocytes are maintained in a reserve to divide if needed c. chondrocytes begin to enlarge in their lacunae as they mature. d. chondrocytes are calcified and abut the diaphysis with osteoblasts. 170 Exploring Anatomy & Physiology in the Laboratory nends upon the b
Explanation / Answer
9. The epiphyseal line is the growth plate (epiphyseal plate) that is present in adults that have stopped growing. Epiphyseal plate is the growing tissue area made up of hyaline cartilage present at the end of long bones in children and adolescents. It determines the length and shape of the future bone. They have weak ligaments that connect bone to bone and tendons that connect bone to muscles. Hence, epiphyseal plate is more prone to injury. The epiphyseal line develops when the epiphyseal plate stopped producing bone. Thus, epiphyseal line is the calcified remnant of the epiphyseal plate. It is present at the metaphysis.
Right choice is b. remnant of the structure from which long bones grow in length.
10. The epiphyseal plate has different zones from the epiphysis to diaphysis.
The zone of reserve cartilage is the zone closest to epiphysis. It has reserve chondrocytes that will divide when required.
The zone of proliferation contains mitotic chondrocytes.
The zone of hypertrophy and maturation contains chondrocytes that undergo hypertrophy as they stop mitosis.
Zone of calcification has apoptotic chrondrocytes with the matrix undergoing calcification.
The zone of ossification is close to and touches the diaphysis. It has calcified chondrocytes and osteoblast. The osteoblasts and osteoclast from diaphysis will break down the calcified cartilage, which is now replaced with mineralized bone tissue.
Right choice is d. chondrocytes are calcified and abut the diaphysis with osteoblasts.
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