Similar Cells serving the same purpose

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Presentation transcript:

Similar Cells serving the same purpose Tissues Similar Cells serving the same purpose

Tissue Types and Varieties Epithelial Tissue Connective Tissue Muscle Tissue Nervous Tissue

Epithelial Tissue / Epithelium Covers the body – lines the cavities Closely packed cells – no matrix Contains no blood vessels Always anchored to a basement membrane.

Classification of Epithelial Tissue By Shape Squamous – flat and scale-like. Cuboidal – square or cube-like. Columnar – columns that are higher than they are wide. By Arrangement Simple – single layer, same shape. Stratified – many layers, same shape. Transitional – several layers changes from one shape to another. Pseudostratified – appears stratified, but all cells attached to basement membrane.

Connective Tissue Most abundant in the body, widely distributed. Has the most forms and varieties Does contain intracellular matrix. Cells called fibroblasts produce reinforcing fibers.

Varieties of Connective Tissue Areolar – glue that holds organs together. Pg. Adipose – (fat) lipid or energy storage. Fibrous – firm yet flexible, ex: tendon. Bone – calcified matrix, functions in support, protection, mineral storage. Haversian systems are bone building areas.

Varieties Continued: Cartilage – Made of chondrocytes. Firm and plastic-like. Blood – Liquid is the matrix, cells are red, white, and platelets. Function is transportation of cellular materials.

Muscle Tissue Skeletal - attaches to bones, also called striated or voluntary, striations visible under microscope. Cardiac - composes walls of heart, also called striated and involuntary, striations visible, intercalated disks present. Smooth - non-striated and involuntary, lines the blood vessels and tube-shaped organs.

Nervous Tissue Neurons - conduct impulses, rapid communication from brain to organs. Components=Axon, Dendrite, Cell Body. Glia - supportive and connective.

Tissue Repair and Regeneration Epithelial and connective regenerate easily. Ex: skin, bone, tendons and ligaments. Muscle and nervous have limited abilities to repair. Ex: paraplegic, quadriplegic, nerve damage.