Make some observations about the following picture…

DO NOW

Chapter 5

TISSUES

1. Explain the 4 types of tissues.2. Identify the different types of epithelial tissue.3. List the locations of each type of epithelial tissue.

OBJECTIVES

1. Histology: The study of tissues

2. Tissues: Groups of cells which are similar in structure and perform common functions.

KEY TERMS

4 BASIC TISSUE TYPES

Locations: 1. Covers the body

(skin)2. Lines cavities, tubes,

ducts, blood vessels

3. Covers organs

EPITHELIAL TISSUE

Functions: 1. Protection from physical & chemical injury

2. Protection against microbial invasion

3. Contains receptors which respond to stimuli

4. Filters, secretes & reabsorbs materials

5. Secretes serous fluids to lubricate structures

EPITHELIAL TISSUE

Facts about Epithelium:- always have one free surface exposed to

the outside or open internal space.- attached to a basement membrane on the

other side.- tightly packed- **Avascular- LACK BLOOD VESSELS, rely

on diffusion from the underlying connective tissue.

- Divide rapidly!

EPITHELIUM

What characteristics distinguish the following groups of cells?

CLASSIFYING EPITHELIUM

1. Layersa) simple = 1 layerb) stratified = multiple layers

2. Shapea) squamous: thin/flat (think

“squished”)b) columnar: tall slender

rectangles (columns)c) cuboidal: square shaped (like

cubes)

CLASSIFYING EPITHELIUM

1. Simple Squamous- absorption

Ex:

2. Stratified Squamous- physical protection against abrasion

- protects against pathogens/chemicals

Ex:

SQUAMOUS

3. Keratinized Stratified Squamous

- layers of dead squamous cells- retards water loss- barrier to organisms

SQUAMOUS

1. Simple Columnar- provides some protection

- absorption/secretion

- usually contain “goblet” cells

Ex:

2. Stratified Columnar- *rare

- secretion/absorption

Ex: small portion of male urethra

COLUMNAR

3. Pseudostratified Ciliated Columnar – all cells touch basement membrane

COLUMNAR

Smoking = goodbye cilia

1. Simple Cuboidal- secretion/absorption

- secretes sweat

- produces sperm & hormones

- line ducts

Ex:

2. Stratified Cuboidal- *rare

- usually only 2-3 layers

- ducts of glands

Ex:

CUBOIDAL

Duct

Cuboid Cells

- Stratified- Tolerates repeated stretching- Ex:

TRANSITIONAL

Identify the types of epithelium on your worksheet by yourself. Go over your

answers with the person sitting next to you to see if you got similar answers.

THINK-PAIR-SHARE

1. Take out your cell phones for PollEverywhere!

CLOSING

1. How is epithelial tissue classified? 2. What is the main function of

epithelial tissue?3. Which type of epithelium would you

find in the intestines that contains goblet cells?

DO NOW

1.Identify slides of tissue using the classification of epitheliail tissue.

2.Compare and contrast exocrine and endocrine glands.

3.List and explain the 3 types of exocrine glands.

OBJECTIVES

Decide which type of epithelium is being shown on the slide. Try to determine what tissue/organ this is a slide of.

IDENTIFYING SLIDES

SLIDES

SLIDES

SLIDES

SLIDES

SLIDES

SLIDES

Endocrine: ductless glands (secreted hormones directly into blood stream)

Exocrine: glands contain ducts that connect with surface

GLANDULAR EPITHELIUM

1) Merocrine: release fluid through exocytosis (ex: tears, gastric juices)

2) Apocrine: release part of cell ( ex: axillary glands, mammary glands)

3) Holocrine: release and destroy whole cell. (ex: sebaceous glands)

TYPES OF GLANDS

Types of Glands Animation

GLANDS

Please take a slide and a microscope. Go through each of the powers under the

microscope, finding the free space that will contain the epithelial tissue. Move the slide accordingly. Call me over to verify that you are looking at the right thing before you move on to the next power.

MICROSCOPE PRACTICE