Epithelial Tissue

Question 1

what is an epithelium

Answer 1

one or more layers of cells that covers or lines the external and internal surfaces of various body parts

Question 2

structure of epithelial tissue

Answer 2

variously shaped cells closely arranged in one or more layers
there is little intercellular material between the cells

Question 3

what does the free surface of epithelial tissue face

Answer 3

body fluid or outside environment

Question 4

two main groups of epithelial tissues

Answer 4

simple and compound

Question 5

structure of simple epithelium

Answer 5

single layer of cells resting on a basement membrane

Question 6

simple epithelium functions as

Answer 6

a lining for body cavities, ducts and tubes

Question 7

types of simple epithelium

Answer 7

squamous
cuboidal/cubical
columnar

Question 8

structure of squamous epithelium

Answer 8

single thin layer of flattened cells with irregular bodies

Question 9

locations of squamous epithelium

Answer 9

innermost walls of blood vessels
air sacs of lungs

Question 10

functions of squamous epithelium

Answer 10

forming a diffusion boundary

Question 11

how are free surfaces of cuboidal epithelium

Answer 11

may be smooth or have microvilli

Question 12

location of cuboidal epithelium

Answer 12

ducts of glands
proximal convulated tubule in nephrons of kidneys (microvilli)

Question 13

functions of cuboidal epithelium

Answer 13

secretion and absorption

Question 14

where do nuclei of columnar epithelium lie

Answer 14

near the bases of the cell

Question 15

how is the free surface of columnar epithelium

Answer 15

smooth or bear microvilli

Question 16

location of columnar epithelium

Answer 16

in the lining of stomach and intestine

Question 17

functions of columnar epithelium

Answer 17

absorption
secretion

Question 18

what is ciliated epithelium

Answer 18

if cuboidal or columnar cells bear cilia on their free surface

Question 19

function of cilia

Answer 19

to move particles or mucus in a specific direction

Question 20

where does ciliated epithelium occur

Answer 20

inner surface of hollow organs like fallopian tubes (oviducts) and bronchioles

Question 21

what are glandular epithelium

Answer 21

some columnar or cuboidal cells get modified for secretion

Question 22

glands are classified based on

Answer 22

cell number
mode of pouring of secretion

Question 23

types of glands based on cell number

Answer 23

unicellular
multicellular

Question 24

example of unicellular gland

Answer 24

goblet cells of alimentary canal

Question 25

examples of multicellular glands

Answer 25

salivary gland

Question 26

types of glands based on mode of puring of secretion

Answer 26

endocrine
exocrine

Question 27

how is the secretion of exocrine glands

Answer 27

passed through ducts or tubes

Question 28

examples of secretions by exocrine glands

Answer 28

mucus
saliva
earwax
oil
milk
digestive enzymes

Question 29

how do endocrine glands secrete

Answer 29

directly into fluid bathing the gland which carry it to target organs

Question 30

location of compound epithelium

Answer 30

dry surface of the skin
moist surface of buccal cavity
pharynx
inner lining of ducts of salivary glands
pancreatic ducts

Question 31

types of junctions

Answer 31

tight junctions
gap junctions
adhering junctions

Question 32

function of tight junctions

Answer 32

help to stop substances from leaking across the tissue

Question 33

function of gap junctions

Answer 33

rapid transfer of ions, small molecules and sometimes big molecules

Question 34

structure of gap junctions

Answer 34

connecting the cytoplasm of adjoining cells

Question 35

adhering junctions perform ______ to keep the neighbouring cells together

Answer 35

cementing