Part IV: Nervous Tissue Main component of nervous system Structure: neuron = dendrite + cell body + axon Function: regulates and controls body functions Location in the body: brain, spinal cord, nerves
Part IV: Nervous Tissue 2 Major Cell Types: Neurons Respond to stimuli Transmit electrical impulses Other cells Support, insulate, protect neurons
Tissue Repair Wound healing Two ways: 1. Regeneration: replace destroyed tissue by same kind of cells 2. Fibrosis: form scar tissue (dense fibrous connective tissue) Depends on: Type of tissue damaged Severity of injury
Steps to Tissue Repair: 1. Inflammation Capillaries become very permeable WBC’s and clotting proteins seep into injured area Clot prevents loss of blood (surface dries, forms a scab)
Steps to Tissue Repair: 2. Granulation tissue forms Delicate pink tissue with new capillaries Connective tissue produces collagen fibers Epithelial cells multiply over granulation tissue
Steps to Tissue Repair: 3. Surface epithelium regenerates Surface epithelium thickens Fibrous tissue matures – forms scar tissue