Epithelial Tissue

Question 1

How can the basement membrane be stained?

Answer 1

With the Periodic Acid Schiff (PAS) reaction

Question 2

Describe, in order of most proximal to the epithelial layer to most distal, the basement membrane.

Answer 2

Lamina lucida: low in density, so clear when stained

Lamina densa: electron-dense, stains darkly, composed mainly of proteoglycans and a certain type of collagen

Reticular lamina: composed of reticular fibers, connects lamina densa to subepithelial connective tissue

Question 3

Give an example of simple squamous epithelium.

Answer 3

lining of blood vessels, pleural and peritoneal cavities, pulmonary alveoli, and glomerular capsule

Question 4

Give an example of simple cuboidal epithelium.

Answer 4

thyroid gland, collecting tubules, collecting ducts of the kidney

Question 5

Give an example of simple columnar epithelium.

Answer 5

stomach, intestine, and gall bladder

Question 6

Give an example of pseudostratified columnar epithelium.

Answer 6

trachea and brinchi (both are also ciliated)

Question 7

Give an example of stratified squamous epithelium.

Answer 7

keratinized: skin

non-keratinized: cornea

Question 8

Give an example of stratified cuboidal epithelium.

Answer 8

lining of the excretory duct of glands

Question 9

Give an example of stratified columnar epithelium.

Answer 9

parotid and mandibular gland ducts

Question 10

Give an example of transitional epithelial.

Answer 10

urinary bladder and urethra

Question 11

Give an example of a tissue with straight tubular glands.

Answer 11

large intestine

Question 12

Give an example of a tissue with coiled tubular glands.

Answer 12

sweat gland

Question 13

Give an example of a tissue with simple branched tubular glands.

Answer 13

stomach

Question 14

Give an example of a tissue with simple alveolar/acinar glands.

Answer 14

sebaceous gland

Question 15

Give an example of a tissue with simple branched alveolar/acinar glands.

Answer 15

large sebaceous gland

Question 16

Give an example of a tissue with simple tubulo-acinar gland

Answer 16

minor salivary gland of oral cavity

Question 17

Give an example of a compound alveolar/acinar gland tissue.

Answer 17

parotid gland

Question 18

Give an example of a compound tubulo-acinar gland tissue.

Answer 18

pancreas

Question 19

Describe serous glands.

Answer 19

They produce a thin, watery secretion with zymogen granules. The nucleus is positioned in the center of the cell.

Question 20

Give an example of a serous gland

Answer 20

parotid gland

Question 21

Describe mucous glands.

Answer 21

Produce a thick secretion that acts as a protective covering. They stain lightly with H&E because of mucin. The nuclei are flattened and displaced towards the basal part of the cell

Question 22

Give an example of a seromucous gland.

Answer 22

mandibular salivary gland

Question 23

Which mode of release secretes granules via exocytosis?

Answer 23

Merocrine

Question 24

Which mode of release secretes membrane-bounded granules with cytoplasm? Give an example.

Answer 24

Apocrine, eg. sweat and mammary glands

Question 25

Which mode of release has the entire cell as the secretory product? Give an example.

Answer 25

Holocrine, eg. sebaceous glands

Question 26

Which mode of release secretes products directly from one cell to the next? Give an example.

Answer 26

Cytocrine, eg. transfer of melanin pigment from melanocytes to keratinocytes