Chapter 3 Tissues Chapter 3 Tissues

Quick and Dirty Quick and Dirty

Tissues Types Tissues Types

1) Epithelial

2) Connective

3) Muscle

4) Nervous

Seems pretty simple right?

Hold that thought…

cause here we go.

Key thing to remember “FORM fits the FORM fits the FUNCTION”FUNCTION”

Tissues: Epithelial Tissues: Epithelial

Described by SHAPESHAPE and LAYERSLAYERS

Layers Layers

Simple:Simple: A layer a single cell thick

Stratified:Stratified: Many layers thick

Tissues: Epithelial Tissues: Epithelial Described by SHAPESHAPE and LAYERSLAYERS

Shapes Shapes “Squamous” (means Scale) = Flat and Thin

Cuboidal (sounds like “Cube” right?) = Cube shaped Columnar (Looks like a “Pillar” right?) = Rectangular in shape

“Squamous” (means Scale) = Flat and Thin“Squamous” (means Scale) = Flat and Thin

Tissues: Epithelial Tissues: Epithelial

So what happens when you put them together?

A Good A Good DescriptionDescription

Stratified Stratified Squamous Squamous EpitheliumEpithelium

Found as: Skin or Skin or the Lining of your the Lining of your EsophagusEsophagus

Now you try oneNow you try one

How many cell layers are there?

1 Making it SIMPLE SIMPLE

What shape are the cells? Pillar-like or Rectangular= ColumnarColumnar

Description (NAME)?Description (NAME)?

Simple Columnar Epithelium Simple Columnar Epithelium

Found in the Found in the GI Tract or GI Tract or Intestines Intestines

Tissues: Connective Tissues: Connective Defining element: Extracellular Extracellular matrixmatrix = a secretion of structureless ground substances and fibers in-between cells Includes Includes

Bone

Cartilage

Tendons and ligaments

Adipose (Butts and breasts)

Basement Membranes (what holds your skin on to your body)

Tissues: Connective Tissues: Connective Here we see the Matrix Matrix of

Bone Bone

Hyaline Hyaline CartilageCartilage

Found in the sternum connecting the ribs

Bone Bone

Tissues: Connective Tissues: Connective FibersFibers also make up a good portion of Connective Tissue.

Example: Collagen Fibers Lets not forget our friend

BloodBlood (Blood Plasma =matrix) He counts too!

Lets not forget our friend BloodBlood (Blood Plasma =matrix) He counts too!

FibersFibers also make up a good portion of Connective Tissue. FibersFibers also make up a good portion of Connective Tissue.

Example: Collagen Fibers

FibersFibers also make up a good portion of Connective Tissue.

Tissues: Muscles Tissues: Muscles

Only 33 kinds (Woo Hoo!!)

Skeletal:Skeletal: Multinucleated, long fibers, Striated & Voluntary

Smooth:Smooth: (makes up hollow organs like the stomach, intestines and blood vessels)

Single nucleated, non-striated Moves things with peristalsis (think of squeezing a tube of toothpaste) & Involuntary

Tissues: Muscles Tissues: Muscles Cardiac Muscle:

Short and Short and BranchedBranched

Connected together by Intercalated discsIntercalated discs (they contain Gap Junctions to send messages to the next muscle cell)

*Why is this important?

Mono-nucleated

Involuntary

Tissues: Nervous Tissues: Nervous NeuronsNeurons are the cell bodies of the Nerve cells

Conduct electrochemicalelectrochemical impulses across the body

They can have extensions that go as long as 3 ft long in some parts of the body!

Tomorrow Tomorrow

We Lab…be readyWe Lab…be ready