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Human Body Study

Connective Tissue

The body’s most abundant and varied tissue — it supports, binds, and connects everything else.

The four tissue types in a generalized organ wall A layered cross-section showing the four tissue types stacked as they combine to build an organ. Each label links to the article for that type: epithelial, connective, muscle and nervous tissue. basement membrane a generalized organ wall free surface Epithelial tissue Connective tissue Muscle tissue Nervous tissue The four tissue types, layered as they combine to build an organ — schematic, not to scale.

Forms

Section titled “Forms”
  • Loose connective tissue — packing material that holds organs in place.
  • Dense connective tissue — tendons (muscle to bone) and ligaments (bone to bone).
  • Adipose tissue — fat; energy store and insulation.
  • Cartilage — firm, flexible support.
  • Bone — rigid, mineralized support.
  • Blood — a fluid connective tissue.

Shared design

Section titled “Shared design”

Unlike other tissues, connective tissue is mostly extracellular matrix — a mix of fibers (such as collagen) and ground substance — with relatively few, scattered cells.

What it does

Section titled “What it does”

Supports and anchors organs, stores energy, transports substances (blood), and helps defend against infection.

Key idea

Section titled “Key idea”

“Connective tissue” is defined not by appearance but by a shared plan: cells embedded in a matrix they secrete — a plan flexible enough to yield both blood and bone.