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Epithelial Tissue
Forms boundaries and covers surfaces, separating the body from the external environment.
Muscle Tissue
Facilitates contraction for movement.
Nervous Tissue
Responsible for communication and control within the body.
Connective Tissue
Offers support and connection between other tissues.
Barrier Formation
A function of epithelial tissue that separates the body from the external environment.
Exocrine Glands
Glands that secrete substances through ducts, such as mucus and sweat.
Endocrine Glands
Ductless glands that release hormones directly into the bloodstream.
Tight Junctions
Cell junctions that seal spaces between cells to prevent the passage of substances.
Avascular
Describes tissues that lack blood vessels and receive nutrients through diffusion.
Basal Surface
The surface of epithelial cells that attaches to the basement membrane.
Apical Surface
The surface of epithelial cells that faces the lumen or external environment.
Small Intestine
An example of epithelial tissue that specializes in nutrient absorption.
Gastric Gland
Specialized epithelial cells that generate and secrete acids in the stomach.
Continuous Capillaries
Capillaries characterized by tight junctions that act as barriers.
Fenestrated Capillaries
Capillaries with small pores for increased permeability.
Transitional Epithelium
A specialized form of epithelium that can expand and contract.
Cell Layers
Criteria used to classify epithelial tissue as simple (one layer) or stratified (multiple layers).
Cell Shape
Criteria used to classify epithelial cells as squamous (flat), cuboidal (cube-shaped), or columnar (column-shaped).