Chapter 4: Tissues

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Chapter 4 Tissues

• Epithelial
• - cover and line
• Connective
• - bind and support
• Muscle
• - move
• Nervous
• - receive and conduct impulses

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Fig. 4.3
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• Location
• Structure
• Function

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Epithelial Tissues

• Tightly packed cells that line body surface and
  inner cavities
• Externally
• - protects from injury, drying, pathogens
• Internally
• - secretion, mucous move., absorption

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Fig. 4.1
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Function Gas exchange
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Function Excretion and reabsorption
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Function secrete mucous and digestive juices
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Function mucous movement
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Function Protection from damage, water loss,
pathogens
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Fig. 4.2f
Function Protection against caustic urine
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Connective Tissues

• Bind organs together, support/ protect, fill
  spaces, produce blood cells, store fat
• What is the matrix?
• Collagen vs. elastin

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Fig. 4.5b
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Fig. 4.5c
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Fig. 4.5e
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Chondrocytes and lacunae
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Osteocytes, lacunae, canaliculi, and Haversian
canals
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Muscle Tissues

• Cells are muscle fibers
• Movement
• Actin and myosin
• Striations
• Involuntary vs. Voluntary
• Number of nuclei

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Nervous Tissue

• Sensory input, integration, motor output
• Cells are neurons
• Dendrite, cell body, axon
• Neuroglia
• Half the brains volume (9 neuroglia 1 neuron)
• Nourish and support neurons

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Fig. 4.8
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Fig. 4.10
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Wound contracture

• Larger wounds have more granulation tissue
• Contraction of fibroblasts (in granulation
  tissue) pulls edges of wound close together
• Scars (major problem in burn victims)