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What are tissues made of?

Tissues are groups of cells of similar type that work together. In humans, there are several types of tissues, each with their own functions. These tissues come together to make organs. The tissues of humans include epithelial tissues, connective tissues, muscle tissues, and nervous tissue. Epithelial tissues include squamous epithelium with flat cells, columnar epithelium for absorption, cuboidal epithelium in glands and ducts, and transitional epithelium. Epithelium (except transitional) can be simple or stratified depending...

Tissues are groups of cells of similar type that work together. In humans, there are several types of tissues, each with their own functions. These tissues come together to make organs. The tissues of humans include epithelial tissues, connective tissues, muscle tissues, and nervous tissue. Epithelial tissues include squamous epithelium with flat cells, columnar epithelium for absorption, cuboidal epithelium in glands and ducts, and transitional epithelium. Epithelium (except transitional) can be simple or stratified depending on the number of layers. Psuedostratified epithelium is found in the respiratory tract and appears to be stratified, but all cells are actually attached at the basal surface to the basement membrane.


Connective tissue includes blood, bone, cartilage, dense, regular connective tissue (tendons), dense, irregular connective tissue (dermis of skin), areolar connective tissue, and adipose tissue (fat).


Muscular tissue includes skeletal muscle that allow for voluntary movements of the body, smooth muscle that surrounds many of the organs of the digestive tract, and cardiac muscle that makes up the walls of the heart.


Nervous tissue includes both neurons that transmit electrical impulses and neuroglia which are supportive cells that provide nourishment and protection for the neurons.

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