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Chapter 04
Lecture Outline
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Chapter 4-Tissues
• What is a tissue?
group of cells with similar structure and
function plus extracellular substance (matrix)
• Histology:
study of tissues
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Classification of Tissues
• Structure of cells
• Extracellular matrix
• Functions of the cells
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Embryonic Tissue
• Endoderm:
digestive tract
• Mesoderm: muscle,
bone & blood
vessels
• Ectoderm: skin and
nervous system
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Embryonic Tissue
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Types of Tissues
1. Epithelial
2. Connective
3. Muscular
4. Nervous
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Epithelial Tissues
• Location:
- cover body (internal and external)
- Ex. Skin, kidney, trachea, glands, etc.
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• Characteristics:
- cells close together (very little extracellular
matrix)
- form most glands
- have free surface and lateral surface
- Basal surface:
attaches epithelial cells to underlying tissues
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• Basement Membrane
– Specialized type of extracellular material
– Secreted by epithelial and connective tissue cells
– Functions
• Attaches cells to underlying tissue
• Supports and guides cell migration
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Functions of Epithelial Tissues
1. Protect:
Ex. Skin
2. Act as a barrier:
Ex. Skin keeps bacteria out
3. Diffusion and Filtration:
Ex. Lungs and kidneys
4. Secretion:
Ex. Sweat glands
5. Absorption:
Ex. Small intestine
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Classification of Epithelial Tissue
• Classified according to number of cell layers
and cell shape
• Simple and stratified = number of cell layers
• Squamous, cuboidal, columnar, transitional= cell
shape
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Types of Epithelial Tissues
• Simple Epithelium
Structure: 1 layer of cells
• Stratified Epithelium
Structure: many layers of cells
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• Simple Squamous
Structure: 1 layer of flat, tile-like cells
Function: diffusion and filtration
Location: blood vessels, lungs, heart, kidneys
• Simple Cuboidal
Structure: 1 layer of square-shaped cells
Function: secretion
Location: glands, ovaries, kidneys
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• Simple Columnar
Structure: 1 layer of tall, narrow cells
Function: secrete mucus and absorption
Location: stomach, intestines, resp. tract
• Pseudostratified Columnar
Structure: 1 layer of tall, narrow cells
appears stratified but isn’t
Function: secrete mucus and propel debris out of
resp. tract (cilia)
Location: nasal cavity and trachea
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• Stratified Squamous
Structure: many layers of flat, tile-like cells
Function: protect and acts as a barrier
Location: skin, mouth, throat, esophagus
• Transitional
Structure: special type of stratified epi. changes
shape (stretched squamous, not stretched
cuboidal)
Function: hold fluids
Location: urinary bladder
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Tab.
4.2b
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Tab
.
4.2c
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Free Cell Surfaces
• Surface not in contact with other cells
• Smooth to reduce friction, Ex. Blood vessels
• Microvilli:
- increase cell’s surface area
- Ex. Small intestine
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• Cilia:
- move materials across cell’s surface
- Ex. Trachea
• Goblet cells:
- produce mucus
- Ex. Stomach
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Cell Connections
• Tight junctions:
- bind adjacent cells together; permeability
barrier
- Ex. Intestines
• Desmosomes:
- mechanical links that bind cells
- disk-shaped
- adhesive glycoproteins & intermediate filaments
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• Hemidesmosomes:
bind cells to basement membrane
• Gap junctions:
- small channels that allow molecules to pass
between cells
- allow cells to communicate
- most common
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Figure 4.2
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Glands • What are they?
structures that secrete substances onto a surface, into
a cavity, or into blood
• Exocrine glands:
- glands with ducts
- Ex. Sweat or oil glands
• Endocrine glands:
– no ducts (directly into bloodstream)
– Ex. Thyroid, thymus, pituitary glands, etc.
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Types of Exocrine Glands
• Simple:
no branches
• Compound:
many branches
• Tubular:
end of duct
• Alveolus:
sac-like structure
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Connective Tissues Characteristics
• Cells far apart
• Contain large amounts of extracellular matrix
• Classified based on type of extracellular matrix
and function
• Ex. Blast cells build, clast cells carve
• Extracellular matrix contains 3 components (in
varying amounts): protein fibers, ground
substance, fluid
• Ground substance: proteins and sugars
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Types of Protein Fibers
• Collagen fibers:
look like ropes and are flexible but resist
stretching
• Reticular fibers:
supporting network that fills spaces between
organs and tissues
• Elastic fibers:
recoil after being stretched
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Functions of Connective Tissue
1. Enclose and separate:
Ex. around organs and muscles
2. Connect tissues:
Ex. Tendons: connect bone to muscle
Ex. Ligaments: connect bone to bone
3. Support and Movement:
Ex. bones
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4. Storage:
Ex. bones store calcium and adipose tissue
stores fat
5. Cushion and insulate:
Ex. adipose tissue protects organs and helps
conserve heat
6. Transport:
Ex. Blood
7. Protect:
Ex. Immune cells
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Types of Ordinary Connective Tissue
• Loose
Location: between organs, muscles, glands, skin
Structure: collagen fibers far apart
Function: support and protect
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• Dense
Location: tendons, ligaments, skin
Structure: collagen fibers packed close together
Function: connect and can withstand pulling
forces
• Adipose
Location: under skin and around organs
Structure: collagen and elastic fibers, cells filled
with lipids
Function: storage, insulate, cushion
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Cartilage
• Type of connective tissue
• Composed of chondrocytes
• Contains collagen
• Withstands compressions
• Provides support, flexibility, strength
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Types of Cartilage
• Hyaline cartilage
Location: covers ends of bones
Structure: some collagen fibers
Function: reduces friction (cushion)
• Fibrocartilage
Location: between vertebra
Structure: lots of collagen fibers
Function: can withstand compression
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• Elastic cartilage
Location: ear and tip of nose
Structure: elastic fibers
Function: can recoil
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Bone
• Hard connective tissue
• 2 types: compact and spongy
• Composed of osteocytes
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Blood
• Liquid connective tissue
• Erythrocytes,
leukocytes, platelets
• Transport food, oxygen,
waste, hormones
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Muscular Tissue Muscle type Nucleus/i Nucleus/i location Striated
Skeletal many peripheral Y
(most muscle)
Cardiac 1 centrally Y
(heart)
Smooth 1 centrally N
(organs)
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Nervous Tissue
• Consist of neurons or nerve cells
• Found in brain, spinal cord, and peripheral nerves
• Controls and coordinates body movements
• Includes axons, dendrites, cell bodies
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