ANAT 261 Lecture Notes - Osteon, Lysosome, Epiphyseal Plate

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Cartilage and bone are specialized types of ct which secrete a firmer ecm than normal. This is due to the presence of other minerals which harden the matrix. Cartilage allows the tissue to support mechanical stress without distortion and also provides support to adjacent soft tissues. This allows for movement and flexibility (such as in the nose and ears) Cartilage consists of chondrocytes and an extensive ecm contain fibers and ground substance. These cells are located in spaces within the ecm known as lacunae or chondroplasts : these cells form groups known as isogenic groups. Elastic cartilage (nose, ear and larynx: flexible, soft. Fibrocartilage (intervertebral discs: hard, won"t be seen in the lab. The ecm for these three types of cartilage differs from one another: Fibers: collagen type ii in hyaline and elastic cartilage, elastic fibers in elastic cartilage, collagen type i in fibrocartilage. Ground substance stays the same for them all: proteoglycans including keratin sulfate and chondroitin sulfate.

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