Question

station 2
introduction: epithelial tissue
scan the qr code to the right and use the video to answer the following questions

1. epithelial tissue creates ____try____ the body.
2. what is the difference between proper epithelium and glandular epithelium?
3. why is having lining of our internal organs important?
4. epithelial tissues are avascular, meaning they dont have their own blood supply. what do they rely on instead?
5. epithelial tissues are classified by their __ and __
6. create a 4x4 chart on your answer sheet. in the 1st column, list the 3 different shapes of epithelial cells. in the 2nd column, draw a picture of each. in the 3rd column, write how the shape of the cells determines the function of the tissue. in the 4th column, write a way to remember the name of each type.
7. which type of cells are easier to replace, and thus can be found in places like our mouth and outer skin where we lose cells a lot?
8. explain the difference between the three main types of cell layering seen in epithelial tissues.
9. what are the first and last names of epithelial tissues?
10. give an example of a secretion by an endocrine gland and a secretion by an exocrine gland.

Explanation:

1. Epithelial tissue creates a barrier for the body.
2. Proper epithelium is a continuous layer of cells covering body surfaces and lining body cavities, while glandular epithelium is specialized for secretion and forms glands.
3. Having lining of internal organs is important as it protects organs, helps in absorption, secretion and filtration.
4. Epithelial tissues are avascular and rely on diffusion from underlying connective - tissue blood vessels for nutrients and gas exchange.
5. Epithelial tissues are classified by their cell shape and number of cell layers.
6. The three shapes of epithelial cells are squamous (flat, scale - like; good for rapid diffusion, remember as 'squished' flat cells), cuboidal (cube - shaped; involved in secretion and absorption, remember 'cube' shape), and columnar (tall and rectangular; often for absorption and secretion, remember 'column' - like height).
7. Squamous epithelial cells are easier to replace and are found in areas like the mouth and outer skin.
8. The three main types of cell layering in epithelial tissues are simple (one layer of cells, good for diffusion), stratified (multiple layers, for protection), and pseudostratified (appears stratified but all cells touch the basement membrane, often ciliated for movement of substances).
9. The types of epithelial tissues are named based on cell shape (first name) and number of layers (last name), e.g., simple squamous, stratified cuboidal.
10. An example of an endocrine gland secretion is insulin (secreted by the pancreas to regulate blood - glucose levels), and an example of an exocrine gland secretion is sweat (secreted by sweat glands to regulate body temperature).

Answer:

1. A barrier for
2. Proper epithelium is a continuous cell layer covering surfaces and lining cavities; glandular epithelium is for secretion and forms glands.
3. Protects organs, aids in absorption, secretion and filtration.
4. Diffusion from underlying connective - tissue blood vessels.
5. Cell shape; number of cell layers
6. Squamous: flat, scale - like; good for rapid diffusion; remember as 'squished' flat cells. Cuboidal: cube - shaped; involved in secretion and absorption; remember 'cube' shape. Columnar: tall and rectangular; often for absorption and secretion; remember 'column' - like height.
7. Squamous epithelial cells
8. Simple: one layer, for diffusion. Stratified: multiple layers, for protection. Pseudostratified: appears stratified but all cells touch basement membrane, often ciliated for movement of substances.
9. Named by cell shape (first) and number of layers (last), e.g., simple squamous, stratified cuboidal.
10. Endocrine: insulin. Exocrine: sweat.