48. covering epithelia-simple 49. stratified

Question 1

What are the covering simple epithelium

Answer 1

simple squamous
simple cuboidal
simple columnar
pseudostratified

Question 2

Structure of simple squamous and where its distributed

Answer 2

thin cells, nuclei flattened and elliptical

endothelium (lines blood vessels) and mesothelium (lines body cavities like peritoneum)

Question 3

structure and distribution of simple cuboidal cells

Answer 3

roughly square shape and central round nucleus

covering: ducts of exocrine glands, ovaries

absorptive: walls of renal tubules

secretory: thyroid gland follicles

Question 4

structure and distribution of simple columnar

Answer 4

elongated cell with elongated nuclei located near base

covering: ducts of exocrine glands

secretion: stomach can find goblet cells , large intestine, uterus

absorption: intestinal villi (enterocytes)

cilliated: fallopian tubes, distal bronchi

Question 5

structure of pseudostratified and distribution

Answer 5

irregular cells attached to basement membrane
looks stratified but nuclei are just on different levels

lines upper respiratory tract eg trachea
cilliated

Question 6

types of covering stratified epiothelium

Answer 6

stratified squamous - keratinized+ non keratinized
stratified cuboidal
stratified columnar
transitional

Question 7

What are the cell types of pseudostratified

Answer 7

basale, small granukes, cilia cells, brush cells, mucous cells

Question 8

structure and distribution of transitional epithelium

Answer 8

has ability to change shape depending on distention of the organ
superficial cell type= umbrella cells which can withstand toxic substances of urine
limes hollow organs of urinary system

basal cells, pear shaped cells, binucleated umbrella cells

Question 9

structure and distribution of stratified squamous keratinized epithelium

Answer 9

stratum basale
stratum spinosum
stratum granulosum
stratum lucindum
stratum corneum- squamous anucleated cells with keratin

found on epidermis- keratinization prevents water loss

Question 10

structure and distribution of stratified squamous non keratinized epithelium

Answer 10

basal cell layer=columnar
middle=polygonal
superficial=squamous and nucleated

covers wet surfaces: oesophagus, vaginal, anal canal, oral cavity