by Alexis Morris

What is a tissue?

A tissue is a group of cells working together to perform certain functions.

The 4 types of tissues are:

  • muscles
  • nervous
  • epithelial
  • connective


  • muscles- movement, maintenance of posture, joint stabilization, and heat generation
  • nervous-receives information from skin and muscle sensory receptor and sends out movement instructions
  • Epithelial-Protection, secretion, absorption, excretion, sensory perception
  • connective- to support, anchor, and connect various parts of the body


  • muscle- cardiac, skeletal, and smooth
  • nervous- nuerons, nueroglia
  • epithelial- transitional, stratified columnar, stratified cuboidal, stratified squamous, psuedostratified ciliated columnar, simple columnar, simple cuboidal, and simple squamos
  • connective- loose, adipose, fibrous, cartilage, bone, and blood

Specialization of Epithelial

  • Lateral cell surfaces
  • Maintain close cell-to-cell contact and form covering sheets
  • Epithelium structurally and functionally polarized to increase efficiency of absorption and transport

Where these tissues can be found

  • muscular- stomach, walls of the heart, and hollow organs
  • nervous- brain, spinal cord, and nerves
  • epithelial- skin, lungs, the gastrointestinal tract, the reproductive and urinary tracts, and make up the exocrine and endocrine glands.
  • connective- all throughout the body

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