뒤로Bones and Skeletal Tissue: Structure, Function, and Physiology
스터디 가이드 - 스마트 노트
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Chapter 6: Bones & Skeletal Tissue
Introduction
This chapter explores the structure, function, and physiology of bones and skeletal tissues, which form the framework of the human body. Understanding these components is essential for comprehending movement, protection, and metabolic functions in Anatomy & Physiology.
Functions of the Skeleton
Main Functions
Support: Provides the structural framework for the body, supporting soft tissues and giving shape to the organism.
Protection: Shields vital organs such as the brain (skull), spinal cord (vertebral column), and thoracic organs (ribcage).
Anchorage: Serves as attachment points for muscles, allowing bones to act as levers for movement.
Mineral Storage: Stores essential minerals, primarily calcium (Ca2+) and phosphate (PO43−), which can be released into the bloodstream as needed.
Blood Cell Formation: Houses red bone marrow, the site of hematopoiesis (production of blood cells).
Fat Storage: Stores triglycerides in yellow bone marrow, primarily in long bones.
Hormone Production: Produces osteocalcin, a hormone involved in regulating bone formation and energy metabolism.
Types of Skeletal Tissues
Overview
The skeleton is composed of various types of connective tissues, each with specialized functions and properties.
Hyaline Cartilage: Provides support with flexibility and resilience. It is the most abundant cartilage type, found at articular surfaces, costal cartilages, and the nose.
Elastic Cartilage: Contains more elastic fibers, allowing it to maintain shape while providing flexibility. Found in the external ear (pinna) and epiglottis.
Fibrocartilage: Highly compressible with great tensile strength due to thick collagen fibers. Located in intervertebral discs and menisci of the knee.
Compact Bone: Dense, solid bone tissue forming the outer layer of bones, providing strength for weight-bearing.
Spongy Bone: Porous, trabecular bone found inside bones, containing red or yellow marrow.
Table: Types of Skeletal Tissues
Type | Main Features | Locations |
|---|---|---|
Hyaline Cartilage | Firm, glassy matrix; supports and cushions | Articular surfaces, costal cartilages, nose |
Elastic Cartilage | Flexible, maintains shape | External ear, epiglottis |
Fibrocartilage | Strong, resists compression and tension | Intervertebral discs, menisci |
Compact Bone | Dense, strong, forms outer bone layer | Diaphysis of long bones, outer surfaces |
Spongy Bone | Porous, contains marrow | Epiphyses of long bones, interior of flat bones |
Additional info:
Cartilage is avascular and relies on diffusion for nutrient supply.
Bone is highly vascularized, allowing for rapid growth and repair.
