TISSUE CLASSIFICATION

There are 4 types of tissues. Epithelial, connective, muscular and nervous.

1) EPITHELIAL TISSUE (Avascular)

Tissue that covers and lines the body's internal and external surfaces. Epithelial cells are classified by the amount of layers and its shape.

• Simple- one layer of cells

• Stratified one or more layers

  • Squamous(flat and scale like)

  • Cuboidal(Cubed)

  • Columnar(Tall)

2)CONNECTIVE TISSUE (Vascular)

Tissue that's most abundant Tissue type of the body. Provides support and binding. They are composed of extracellular matrix: ground substance and fibers.

• Ground substance- glycoproteins and polysaccharide molecules

• Laguna- fibers: college ice, elastic, and reticular

3) MUSCLE TISSUE(Vascular)

Tissue that's specialized in producing movement through contraction. It has 3 types:

• Skeletal muscle- the meat or flesh attatched to the bones, are cells that are long-cylindrical shaped.

  • Voluntary

  • Striated

  • Multinucleate

  • Function-movement and lever

• Cardiac muscle- The walls of the heart and found only on the heart. It is cells that are branched in intercalated discs.

  • Involuntary

  • Striated

  • Uninucleate

  • Function- Pumps heart

• Smooth muscle- Muscle tissue found only in hollow organs ex: digestive and urinary tract, blood vessels etc. Are two layered cells that are spindle shaped.

  • Involuntary

  • Non-striated

  • Uninucleate

  • Function- propels substances along pathways and constrict/dilate organs cavities.

4) NERVOUS TISSUE

Tissue composes that the nervous system. It has branching cells, cell body and dendrites. It is composed of two types:

• Neurons- conducts impulses and receives the stimuli

  • All neurons have a nucleus and cell body

• Neuroglia- cells that provide protection, support, and insulation to neurons.