Lec 3 Tissue 1

Question 1

what are the 4 basic types of tissue?

Answer 1

epithelium
connective tissue
muscle
nervous tissue

Question 2

what are the general characteristics of the epithelium?

Answer 2

consists of cells held closely by cellular adhesions resting on a basement membrane

highly cellular - very little intercellular material

AVASCULAR

Question 3

what does avascular mean?

Answer 3

• not penetrated by blood vessels. recieves nutrients by diffusion from underlying tissue.

Question 4

membranous functions of the epithelium?

Answer 4

protection - covers body surfaces

lines body cavities [digestive tract, blood vessels]

contains cells for sensory reception

absorption and secretion of nutrients and other products

filtration (kidney)

Question 5

glandular functions of the epithelium?

Answer 5

production and secretion of hormones and substances

Question 6

what are the diff cell layers of the epithelium? describe each

Answer 6

simple - one cell layer
stratified - many cell layers
pseudostratified - consists of a “single” layer of cells since each cell contacts the basement membrane

Question 7

what are the diff shapes of epithelium cells? describe each

Answer 7

squamous - flat cells.

cuboidal - cube shaped

columnar - rectangular shaped. most organelles have this type

Question 8

what are the 2 classification of glands?

Answer 8

endocrine and exocrine glands

Question 9

what is the function of the endocrine gland? name an example

Answer 9

secrete hormomes DIRECTLY INTO BLOODSTREAM

ex: thyroid gland

Question 10

what is the function of the exocrine gland?

Answer 10

secrete products through a DUCT to site of action

Question 11

2 types of exocrine glands?

Answer 11

unicellular - globlet cell produces mucous

multicellular - salivary glands

Question 12

types of multicellular exocrine glands?

Answer 12

simple tubular, simple alveolar, compound tubular of alveolar

Question 13

function and location of simple squamous?

Answer 13

function - filtration and diffusion
location - blood vessels and alveoli

Question 14

function and location of simple cuboidal?

Answer 14

function - secretion and absorption
location - glands and kidney

Question 15

function and location of simple columnar?

Answer 15

func - secretion and absorption
location - digestive tract. intestines and stomach

Question 16

function and location of stratified squamous?

Answer 16

func - filtration and diffusion
location - beginning of mouth, end of GI tract, esophagus, vagina, skin

Question 17

function and location of stratified cuboidal?

Answer 17

func - secretion and absorption
location - glandular epithelium [sweat, salivary]

Question 18

function and location of stratified columnar?

Answer 18

func - secretion and absorption
location - larynx

Question 19

function and location of pseudostratified ciliated columnar?

Answer 19

func - secretion and absorption
location - respiratory epithelium: nasal cavity, tracea & bronchi

Question 20

function and location of transitional epithelium?

Answer 20

func - stretching organs, cells can change shape, storage of fluids.

location - stretching organs = stomach, urinary bladder, uterus