뒤로Bones and Bone Tissue: Structure, Function, and Classification Chapter 6
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Bones and Bone Tissue
Overview of the Skeletal System
The skeletal system is a complex organ system that provides structure, protection, and support for the human body. It consists of bones, joints, and supporting tissues.
Bones: The main organs of the skeletal system. Adults typically have 206 bones.
Each bone includes:
Bone (Osseous) Tissue
Dense regular collagenous tissue
Dense irregular connective tissue
Bone Marrow
Functions of the Skeletal System
The skeletal system performs several vital functions necessary for survival and homeostasis.
Protection: Bones such as the skull, sternum, and ribs protect underlying organs (e.g., brain, heart, lungs).
Mineral Storage and Acid-Base Homeostasis: Bones store minerals including calcium, phosphorus, and magnesium salts, which are essential for various physiological processes and help buffer blood pH.
Blood Cell Formation: Red bone marrow is the site of hematopoiesis, the formation of blood cells.
Fat Storage: Yellow bone marrow contains adipocytes that store triglycerides, serving as an energy reserve.
Movement: Bones serve as attachment sites for skeletal muscles. Muscle contraction pulls on bones, generating movement at joints.
Support: The skeleton supports the body's weight and provides its structural framework.
Classification of Bones by Shape
Bones are classified based on their shapes, which relate to their functions and locations in the body.
Long Bones: Longer than they are wide. Examples: bones of the limbs (e.g., femur, humerus).
Short Bones: About as long as they are wide; roughly cube-shaped. Examples: wrist (carpals) and ankle (tarsals) bones.
Flat Bones: Thin and broad. Examples: most skull bones, sternum, ribs, and bones of the pelvis.
Irregular Bones: Have irregular shapes. Examples: vertebrae, certain facial bones.
Sesamoid Bones: Small, flat, oval-shaped bones located within tendons. Example: patella (kneecap).
Table: Classification of Bones by Shape
Type | Description | Examples |
|---|---|---|
Long Bones | Longer than wide | Femur, humerus, phalanges |
Short Bones | Cube-shaped, as long as wide | Carpals, tarsals |
Flat Bones | Thin, broad | Sternum, ribs, skull bones |
Irregular Bones | Complex, irregular shapes | Vertebrae, some facial bones |
Sesamoid Bones | Small, oval, within tendons | Patella |
Key Terms
Osseous Tissue: The primary tissue of bone, providing strength and structure.
Bone Marrow: Soft tissue inside bones; red marrow produces blood cells, yellow marrow stores fat.
Hematopoiesis: The process of blood cell formation, occurring in red bone marrow.
Example: Application of Bone Functions
The skull protects the brain from injury.
The femur supports body weight and enables movement at the hip and knee joints.
Red bone marrow in the pelvis is a major site for blood cell production in adults.
Additional info: The classification of bones by shape is fundamental for understanding their roles in movement, protection, and support. Each bone type is adapted to its specific function in the body.
