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Lab Science Course.

Four types of tissues found in animals

epithelial, connective, muscle, and nervous

Epithelial tissue classified as

simple or stratified

Simple Epithelial tissue

has only one layer of cells

Stratified Epithelial tissue

has several cells layers

Simple squamous epithelium

characterized by flattened, irregulary shaped cells that form a continuous sheet.

Simple cuboidal epithelium

characterized by cube-shaped cells with a nucleus that is usually round and centrally located.

Simple columnar epithelium

composed of cells that are taller than they are wide, and the nucleus is located towards the base of the cell.

Connective Tissue

characterized by a fluid, semisolid, or solid matrix in which cells and fibers are embedded; four general catergories.

Connective Tissue Proper, cartilage, bone, and blood

Four general categories of connective tissue

Connective tissue proper

loose connective tissue, dense regular connective tissue and adipose tissue comprise this.

Loose connective (areolar) tissue

characterized by fibers that are irregularly arranged in the matrix; two types of fibers are present: collagen and elastic.

Collagen fibers

appear pink.

Elastic Fibers

appear as blue-black strands randomly arranged in the matrix.

Dense Regular connective tissue

contains collagen fibers that are arranged in parallel. Between fibers are flattened rodlike nuclei of fibroblasts.

Adipose tissue

contains ___cells that are closely packed; cells appear empty because fat was removed during tissue preparation. Cytoplasm and nucleus located at periphery of cell.


connective tissue with semisolid matrix; within matrix are fibers and chondrocytes.


cartilage cells located within round-ovoid spaces called lacunae.

Hyaline Cartilage

composed of collagen and chondrocytes

Elastic Cartilage

contains collagen fibers, chondrocytes, and elastic fiber that are found between lacunae.


consists of a hard matrix of calcium salts; the calcium salt makes it hard.


characterized by central (Haversian) canal.


Lacunae, which hold the osteocyte (bone cells), are arranged in concentric rings around the central Haversian canal.


composed of a fluid matrix.


numerous erythrocytes and few leukocytes present in matrix; some platelets scattered around.


three types of this kind of tissue; composed of muscle fibers.

Skeletal muscle fibers

characterized by fibers that have light and dark striping or cross-striations. Each fiber is multinucleated; nuclei are located of priphery of each fiber.

Cardiac muscle fibers

have cross-striations and are branched; adjacent fibers are separated by dark-staining structures called intercalated disks; single nucleus in each cardiac muscle fiber.

Smooth muscle fibers

have no cross-striations; single elongated or ovoid nucleus is present in each fiber.

Nervous tissue

composed of neurons and neuroglia (neuroglial cells)


consist of a cell body, dendrites, and an axon. Several Cytoplasmic processes radiate from the cell body, which holds the nucleus.

Neuroglial cells

cannot be distinguished because cytoplasm is unstained in tissue prep; however, nuclei are visible as dots.

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