September 5-8, 2013

Tissues Part 1

What are these?Tissues!

Epithelial Tissue – lining, covering, & glandular

Connective – protecting, supporting, and binding together

Muscular – movement

Nervous - control

Major Tissue Types & Functions

Epithelial tissues lines all body surfaces and cavities

Functions: protection absorptionfiltrationsecretion

Epithelial Tissue

Special features of epithelial tissue: Cells are tightly bound together Basal surface attached to basement

membrane, apical surface is free. Avascular – no blood supply. Nutrition

and gases diffuse from underlying connective tissue

Excellent regenerative ability. Contain multi- and uni-potent stem cells.

Epithelial Tissue

Turn & Talk:

How does each special feature relate to the functions of epithelial tissue?

- 2 min

Epithelial Tissue

Basic Shapes

Epithelial Tissue

Simple squamous epithelium

A single layer of thin cells, specializing in rapid diffusion and filtration

Found in: alveoli of lungs, walls of capillaries, kidney glomeruli and serosae

Classification of Epithelial Tissues

Simple squamous epithelium

A single layer of thin cells, specializing in rapid diffusion and filtration

Found in: alveoli of lungs, walls of capillaries, kindey glomeruli, and serosae

Classification of Epithelial Tissues

Picture of alveoli of lungs.

Simple cuboidal epithelium

A single layer of cube- shaped cells

Found in: glands, kidney tubules, ovaries

Classification of Epithelial Tissues

Kidney tubules

Simple columnar epithelium

A single layer of tall shaped cells

Often contain mucus- producing Goblet cells and / or cilia Found in: digestive tract (unciliated), bronchi (ciliated), and uterine tubes (ciliated)

Classification of Epithelial Tissues

Small intestine

Simple columnar epithelium

A single layer of tall shaped cells

Often contain mucus- producing Goblet cells and / or cilia Found in: digestive tract (unciliated), bronchi (ciliated), and uterine tubes (ciliated)

Classification of Epithelial Tissues

Uterine tube

Pseudostratified columnar epithelium

A single layer of cells that differ in length.

Often contain cilia and Goblet cells

Found in: respiratory tract

Classification of Epithelial Tissues

trachea

Pseudostratified columnar epithelium

A single layer of cells that differ in length.

Often contain cilia and Goblet cells

Found in: respiratory tract

Classification of Epithelial Tissues

trachea

Notice that the nuclei appear at different levels.

For our purposes: nuclei at different levels + cilia = pseudostratified columnar epithelia

Stratified Squamous Epithelium

Multiple layers of epithelial tissue.

Flattened and atrophied (‘dead’) at the apical edge; but can be rounder at basal edge.

Apical edge sloughs off and is replaced.

Classification of Epithelial Tissues

Esophagus?

Function: protection from wear & tear

Found in skin, mouth, esophagus

Transitional epithelium

Cells can change shape, allowing the tissue to stretch.

Apical cells appear round when tissue is relaxed, and flat with tissue is stretched.

Found in urinary tract.

Classification of Epithelial Tissues

Ureter tube

Transitional epithelium

Cells can change shape, allowing the tissue to stretch.

Apical cells appear round when tissue is relaxed, and flat with tissue is stretched.

Found in urinary tract.

Classification of Epithelial Tissues

Ureter tube

Notice that the cells look rounded and irregular.

Show with fingers:

1) Simple squamous2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional

Quick Review: Epithelia Tissue

Show with fingers:

1) Simple squamous2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional

Quick Review: Epithelia Tissue

Notice the cube-like shapes, and single layers separated by basement membrane

Show with fingers:

1) Simple squamous2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional

Quick Review: Epithelia Tissue

Show with fingers:

1) Simple squamous2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional

Quick Review: Epithelia Tissue

Notice the many layers, and how the cells gradually become flatter

Show with fingers:

1) Pseudostratified columnar2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional

Quick Review: Epithelia Tissue

Show with fingers:

1) Pseudostratified columnar2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional

Quick Review: Epithelia Tissue

Notice multiple layers, cells rounded and irregular

Show with fingers:

1) Pseudostratified columnar2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional

Quick Review: Epithelia Tissue

Show with fingers:

1) Pseudostratified columnar2) Simple cuboidal3) Simple columnar4) Stratified squamous5) Transitional

Quick Review: Epithelia Tissue

Notice the nuclei at different levels, and the cilia

Examine the following tissues under a microscope:Simple cuboidal (kidney tubule)Simple columnar (uterine tube?)Stratified squamous (skin)Transitional (bladder?)Pseudostratified columnar (trachea?)

As you observe these, create a histology guide bysketching each tissue (USE COLOR & LABEL

IMPORTANT FEATURES). Jotting down any notes that will help you identify

the tissue in the futureUse your textbook to list both the FUNCTIONS and

LOCATIONS of the tissues.

You Do:

Spend the time to do this right!!

Draw carefully and accurately. Use color. Compare to your textbook.

ASK FOR HELP IF YOU AREN’T SURE IF YOU ARE SEEING IT!

You will get to use these notes on a lab practical!

Exit Ticket:These are some slides from the beginning of class … can you name them now?