Tissues

by Tia Jones

What is a tissue?

Tissue is a collection of specialize cells and cell products that perform a relatively limited number of functions. It's a mass of similar cells working together to carry out certain common functions.

What are the four types of tissues?

  • Epithelial
  • Connective
  • Muscle
  • Nervous

Functions?

Epithelial - protect the tissues that lie beneath it from radiation, the regulation and exchange of chemicals between underlying tissues, and the secretion of hormones into the blood vascular system

Connective - storage of energy, protective of organs, connection of body tissues

Muscle - movement, maintenance of posture, joint stabilization, heat generation

Nervous - governs the autonomic nervous system and sends out sympathetic signals

Classification?

Epithelial: simple squamous, simple cuboidal, simple columnar, stratified squamous, pseudostratified columnar, transitional epithelium

Connective: loose c.t., adipose tissue, fibrous c.t., cartilage, bone tissue, blood tissue

Muscle: skeletal, smooth, cardiac

Nervous: neurons, neuroglia

Specialization of Epithelial

  • lateral cell surfaces
  • maintain close cell-to-cell contact and form covering sheets
  • epithelial structurally and functionally polarized to increase efficiency of absorption and transport

Examples of Where Types Can Be Found

Epithelial: found throughout the body, covers all body surfaces inside and out

Connective: beneath skin, external ear, around kidneys and eyeball, larnyx

Muscle: stomach, hollow organs, wall of heart

Nervous: brain, spinal cord

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