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The tissue level of organization
Connective, Muscle, and Nervous Tissues
Examples of connective tissue• Solid– Cartilage– Bone– Tendons– Ligaments– Fibrous tissues
• Fluid– Lymph– Blood
Connective tissue functions• Protection• Support• Separation / compartmentalization• Bind organs together• Energy storage
Loose connective tissue
Loose (Areolar) Connective Tissue
Loose connective tissue• Loosely woven fibers produced by fibroblasts• Three types of fibers– Collagenous (collagen): tough, parallel bundles– Elastic (elastin): smaller, still strong, can stretch– Reticular: v. thin branching strong support
Adipose tissue
Adipose tissue• Fat• Found within loose connective– Sub cutaneous = adipose + areolar
• Insulation and protection– Around kidneys, heart surface, joints, behind eye
Dense (regular) connective tissue
Dense connective tissue• Interwoven fibrous bundles• Main components of tendons, aponeuroses
and ligaments– Tendons connect muscles to bone– Aponeuroses are sheet like tendons– Ligaments connect bone to bone
Cartilage• Strong and resilient• Avascular• Growth• Chondrocytes divide• Chondroblasts become
chondrocytes
Types of cartilage• Hyaline, -most abundant in body
– Shock absorption– Embryonic skeleton– At ends of long bones (joints)– Ribs, nose, larynx, trachea, bronchi, bronchioles
• Fibrocartilage – V. strong and rigid– Symphysis pubis and between vertebrae
• Elastic – stretches and retains shape– Epiglottis, external ear, eustachian tubes
Bone
Muscle Tissue
Nervous Tissue