EPITHELIAL
TISSUE
DEFINITION
❑
Epithelial tissues form the covering of the
surfaces of the body located both in
internal and external parts. One example is
skin found in the uppermost layer of the
body which made of epithelial cells.
DEFINITION
❑
❑
Packed tightly (to no intercellular space)
Act as a barrier against mechanical injury,
microbes, and fluid loss
❑
It has a free surface that is exposed to air or fluid
❑
Cells are attached to a basement membrane.
❑
Avascular – not associate with blood vessel
THREE BASIC SHAPES
✓ Flattened, central nucleus
✓ Delicate and thin sheet of cells
Location:
• Lung alveoli
• Blood vessels
• Buccal mucosa
Functions:
• Diffusion
• Gas exchange
✓
Cube-shaped, central
✓ Spherical nucleus
Locations:
•
Linings of kidney
tubules and ducts
•
Salivary glands
Functions:
• Secretion
• Absorption
✓ Oval nucleus near at basal end
✓ Apical surface may have cilia or microvilli
Locations:
• Digestive tract
• Upper respiratory tract
• Oviducts
Functions:
• Absorption
• Secretion
TYPES OF LAYERING
TYPES OF LAYERING
TYPES OF LAYERING
NAMING OF A EPITHELIAL TISSUE
First name: Number of layers.
❑ Last name: Shape of its cells.
❑ Example: Simple squamous epithelium.
❑
MUSCULAR
TISSUE
The muscle tissues
are composed of
muscle cells that
are designed for
contraction and
movement.
These can help us
to do the work.
The muscle cells
are also called
muscle fibers.