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 - 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
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