Tissues

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Tissues
And this
type.....
Epithelial Tissue
- Covers all body surfaces both inside and out.
- Main glandular (glands) tissue.
- Usually has no vascular tissue - blood supply but
does have nerves
- Cells reproduce rapidly (rapid healing).
- Cells tightly packed together
If a girl weighs 100 pounds. How much of her weight is skin?
It takes about 27
days for the outer
layer of skin to
shed and be
replaced; that
works out to 1.5
pounds of skin cells
per year.
Where does
all the dead
skin you
shed go?
Epithelial tissue
Naming is based on
description
simple = single layer
stratified = multiple layers
squamous = flat
cuboidal = square
columnar = column (rectangle)
One type of tissue can be arranged in different forms, each form
has a different function.
Simple Squamous
Simple
Squamous
Tissue
Form: Flat and thin
Function: diffusion and filtration. Air sacs in lungs, walls of capillaries
Simple Cuboidal
Function: Secretion and
Absorption
Found in kidneys
tubules, ducts and
covering the ovaries
Simple Columnar
Function: Secretion
and Absorption
Found in Digestive
tract and uterus
*Contains goblet
cells to secrete
mucus
*Can have microvilli
Stratified Squamous
Multi layer squamous, functions
in protection
Found in skin and mouth
The ink of tattoos must be injected
below the basement membrane.
Tissues often come in
layers on the body superficial cuts on the
skin may need to be
stitched if they also go
through the underlying
tissue.
This will definitely need
stitches!
Pseudostratified Columnar
Single layer, nuclei are uneven which gives it a
layered appearance
Can have goblet cells and cilia
Location: lining
air passages
and tubes of
the
reproductive
system
Transitional Epithelium
Stretchable
Blocks diffusion (no leaking)
Found in the urinary bladder
Glandular Epithelium
Cells are specialized to
produce and secrete substances
They make up the GLANDS
exocrine glands
salivary, sweat
|
endocrine glands
hormones
Identify the tissues
Connective Tissue
-Most abundant tissue in your body, found throughoutBinds structures together
-Provides support, protection, framework, fills space,
stores fat, produces blood cells, fights infection
-Composed of more scattered cells within matrix
-Made up of a ground substance (fluid, semi-solid)
and fibers
-Most has a good blood supply
-Cells can reproduce
Types of Cells in Connective Tissue
●Mast cells (prevents clots)
●Macrophages (consumers)
●Fibroblasts (produce fibers)
Collagenous (bones,
ligaments, tendons)
Elastic (respiratory)
Mast Cell
Main types of Fibers
Collagenous fibers strong and flexible
bones
tendons
ligaments
Elastic fibers - very flexible,
ears and vocal cords
Basement Membrane
Ground substance
Categories of Connective Tissue
Loose Connective Tissue or Areolar Tissue
Binds underlying
organs to skin
and to each other
Forms delicate
thin membranes
throughout the
body
Adipose Tissue (fat)
Fibrous Connective Tissue
Tendons =
muscles to bones
Ligaments =
bones to bones
DENSE CONNECTIVE TISSUE
CARTILAGE
Cartilage cells are called
chondrocytes
Provides support and attachments,
also cushions bones
Hyaline Cartilage
Covers ends of joints, nose and respiratory
passages
Elastic cartilage
External Ear and
Larynx
Hyaline cartilage
Hyaline cartilage
Fibrocartilage
Tough, shock absorbing
Bone Tissue (Osseus)
Blood Tissue
Muscle Tissue
Cardiac muscle
Skeletal muscle
Smooth muscle
Nerve Tissue
Neuroglia (nerve glue):
1. To surround neurons
and hold them in place
2. To supply nutrients and
oxygen to neurons
3. To insulate one neuron
from another
4. To destroy pathogens
and remove dead
neurons.
Nervous tissue (spinal cord)
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