Tissues

Tissues

1. 4. Connective

   • Proper
     • Loose
     • Dense
   • Supporting
   • Fluid

2. 3. Nervous

   • Neuroglia
     • - Support the Neurons. - Communication and control of body function.  - Half of the volume of the CNS. - Smaller, 50 times more numerous. - Help protect and nourish neurons. - Can devide. - Not excitable. 
     • PNS
       • Schwann
       • Satellite
     • CNS
       • Astrocytes
       • Oligodendrocytes
       • Microglia
       • Ependymal
   • Neuron

3. 2. Muscle

   • - Comprised of cells called fibers. - Fibers shorten and contract when stimulated by nervous system = movement.   - Myofilaments (Actin and Myosin) are responsible for muscle contractibility.   *Myo = Muscle
   • Skeletal
     • - Attached to bones of skeleton and some skin cells. - Cylindrical and long (some as long as whole muscle). - Multinucleated. - Striated and voluntary.
   • Cardiac
     • - Found only in the wall of the heart. - Cells are branched, Y-shaped, shorter than skeletal fiber cells.  - Striated and involuntary. - Attached by strong gap junction - intercalated discs (allow rapid passage of electrical current from one cell to the next during each heart beat). 
   • Smooth

4. 1. Epithelial

   •    - Lines every body surface, every cavity and every luman including organs – inside and out. - Majority of glands derived from epithelial tissue.  - Little to no extracellular matrix. - Avascular. - Functions:   Physical protection,             Selective permeability,         Secretions (Glands),  Sensation.
   • Type
     • Simple
       • Single layer. All cells have an apical layer and attached to basement membrane.
     • Stratified
       • Two or more layers. Not all layers have an apical surface, nor do all cells attach to the basement membrane. 
     • Pseudostratified
       • Single layer but not all cells reach the apical surface. Their nuclei give the appearance of multilayered, stratified epithelium - but they are NOT.
   • Morphology
     • Squamous
     • Cuboidal
     • Columnar

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