F OUR T YPES OF A NIMAL T ISSUES. E PITHELIAL T ISSUE (C OVERING ) Tightly-joined closely-packed cells One side of epithelium exposed to air or internal.

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Presentation transcript:

F OUR T YPES OF A NIMAL T ISSUES

E PITHELIAL T ISSUE (C OVERING ) Tightly-joined closely-packed cells One side of epithelium exposed to air or internal fluid, other side attached to a basement membrane, a dense mat of extracellular matrix (connective tissue) Covers the outside of the body and lines the internal organs and cavities Barrier against mechanical injury, invasive microorganisms, and fluid loss Provides surface for absorption, excretion and transport of molecules

T YPES OF E PITHELIAL T ISSUE Cell shape Squamous Cuboidal Columnar Number of cell layers Simple Pseudostratified Columnar RELATE STRUCTURE TO FUNCTION!

C ONNECTIVE TISSUE (F RAMEWORK ) Main function: binding and support other tissues Large amount of extra-cellular matrix with fewer cells Connective tissue cells secrete the extracellular matrix Extracellular matrix consists of network of fibers in liquid, jelly- like or solid matrix

M USCLE T ISSUE (M OVEMENT ) Composed of long cells called muscle fibers Contraction  movement

N ERVOUS TISSUE (C ONTROL ) Senses stimuli and transmits signals called nerve impulses from one part of an animal to another Consists of a cell body and long extensions called dendrites (towards cell body) and axons (towards another cell or an effector) Axon Dendrite Cell body

Tissue TypeEpithelialConnectiveMuscleNerve Cell ShapeFlattened, cuboidal, columnar Irregular or roundElongatedCell appendages branched Cell Arrangement Single  multilayered Scattered in matrix In sheets or bundles Isolated or networked LocationBody covering or lining organs or cavities Supports other organs Lining internal organs, make skeletal muscles Concentrated in brain and spinal cord + all over the body Surface Feature of Cells Cilia, microvilli--- Matrix TypeBasement membrane Varied – protein fibers + liquid, gelatinous, firm to calcified -- Matrix AmountMinimalExtensiveAbsent Unique FeatureNo direct blood supply, except for glands Cartilage has no blood supply Can generate electrical signals, force and movement Can generate electrical signal