Lab 7 Notes

Question 1

Define tissue.

Answer 1

A tissue is a group of similar cells that work together to perform a specific function.

Question 2

What are the four classes of tissues?

Answer 2

1. Connective tissue: functions in binding tissues and anchoring organs to body cavities.
2. Muscular tissue: functions in muscle contraction and movement.
3. Epithelial tissue: functions in secretion, absorption, protection.
4. Nervous tissue: functions in communication.

Question 3

What are the differences between tissue types?

Answer 3

1. Composition of the matrix
2. Ratio of cells to matrix
3. Characteristics of the matrix
4. Type of cells

Question 4

Which germ layer gives rise to fibroblasts?

Answer 4

Mesoderm

Question 5

How is epithelial tissue classified?

Answer 5

1. Cell type
2. Cell shape
3. Cell arrangements

Question 6

What are the facts about the structure of epithelial tissue?

Answer 6

1. Epithelial tissue has a direct nerve supply.
2. It draws its blood supply from the connective tissue.
3. It has a large cellular content with a small amount of matrix.
4. Contains a basement membrane.
5. One surface is free and one surface is attached to the basement membrane.
6. Cells constantly dividing.

Question 7

Where is simple squamous epithelium located and what is its function?

Answer 7

Location: alveoli, lungs, capillary walls, cover body organs & body cavities.

Function: transcellular transport; rapid diffusion.

Question 8

Where is simple cuboidal epithelium located and what is its function?

Answer 8

Location: kidney tubules, glands, lining bronchioles.

Function: secrete mucus in the bronchioles.

Question 9

Where is simple columnar epithelium located and what is its function?

Answer 9

Location: small and large intestines, digestive tract, stomach, uterus, uterine tube.

Function: (secretion & absorption) secretes mucus in the digestive tract.

Question 10

What is pseudostratified epithelium?

Answer 10

Every cell touches the base, yet every cell does not reach the apical surface.

Location: male reproductive tract, respiratory tract.

Function: locomotion, secretion & absorption.

Question 11

What is the function of microvilli in simple columnar epithelium?

Answer 11

Microvilli are found in the digestive tract and increase the surface area to aid in digestion and absorption of nutrients.

Question 12

Would non-keratinized stratified squamous epithelium prevent water loss? Explain why or why not.

Answer 12

No, it would not prevent water loss because it lacks glycolipid. Keratinized stratified squamous epithelium has the dead layer of compact cells surrounded by the water-repellent glycolipid to prevent water loss.

Question 13

Where is stratified squamous epithelium located and what is its function?

Answer 13

Location: skin.

Function: protection, prevent water loss; prevents abrasion.

Question 14

Where is stratified cuboidal epithelium located and what is its function?

Answer 14

Location: lining of the follicles in the ovaries; lining in the seminiferous tubules of testes; sweat ducts.

Function: protection and secretion; acts in secretion.

Question 15

Where is stratified columnar epithelium located and what is its function?

Answer 15

Location: pharynx, larynx, anal canal, male urethra.

Function: found when one type of epithelium meets another.

Question 16

Where is transitional epithelium located and what is its function?

Answer 16

Location: areas that need to stretch or distend; bladder.

Function: top layer of cells can appear round or flat.

Question 17

What are the three germ layers in fetal development?

Answer 17

1. Ectoderm
2. Mesoderm
3. Endoderm