뒤로Supporting Connective Tissue: Cartilage and Bone
스터디 가이드 - 스마트 노트
자료에 맞춘 맞춤형 노트, 핵심 정의, 예시, 맥락을 확장해 제공합니다.
Supporting Connective Tissue
Overview of Supporting Connective Tissue
Supporting connective tissues provide structural support and protection for the body. The two main types are cartilage and bone, each with specialized functions and structures.
Cartilage: Characterized by a gel-like ground substance, cartilage is designed for shock absorption and protection of soft tissues.
Bone: Composed of a calcified matrix made rigid by calcium salts and minerals, bone tissue supports body weight and provides a framework for muscle attachment.
Cartilage
Cartilage Matrix
The matrix of cartilage is a firm, gel-like substance that provides resilience and flexibility. It is composed of:
Proteoglycans: Large molecules derived from chondroitin sulfates that attract water and contribute to the gel-like consistency.
Ground Substance Proteins: These proteins help maintain the structure and function of the matrix.
Chondrocytes: Specialized cells that produce and maintain the cartilage matrix. They are located within small spaces called lacunae (singular: lacuna).
Example: The image provided shows chondrocytes within lacunae, a hallmark of cartilage tissue.
Functions of Cartilage
Provides flexible support to various structures.
Reduces friction and absorbs shock in joints.
Forms the template for bone development in the embryo (endochondral ossification).
Bone
Bone Matrix and Structure
Bone tissue is a rigid form of connective tissue that supports body weight and protects internal organs. Its matrix is:
Calcified: Hardened by the deposition of calcium salts and minerals, making it strong and durable.
Weight Support: The rigidity of bone allows it to bear the weight of the body and serve as a lever for muscle action.
Comparison of Cartilage and Bone
Both cartilage and bone are types of supporting connective tissue, but they differ in structure, composition, and function.
Feature | Cartilage | Bone |
|---|---|---|
Matrix | Gel-like, rich in proteoglycans | Calcified, rich in calcium salts |
Cells | Chondrocytes in lacunae | Osteocytes in lacunae |
Vascularity | Avascular (no blood vessels) | Highly vascular |
Function | Shock absorption, flexible support | Weight support, protection, mineral storage |
Key Terms
Chondrocyte: A cell that produces and maintains the cartilaginous matrix.
Lacuna (plural: lacunae): A small cavity within the matrix that houses a chondrocyte or osteocyte.
Proteoglycan: A compound consisting of a protein bonded to glycosaminoglycan groups, present especially in connective tissue.
Calcification: The process by which calcium salts build up in body tissue, causing the tissue to harden.
Additional info:
Cartilage is avascular, meaning it does not contain blood vessels. Nutrients diffuse through the matrix to reach chondrocytes.
Bone is highly vascularized, allowing for efficient nutrient and waste exchange.
