Tissues. tissue = many cells w/ same structure and function. cell shape aids function tissue shape aids function. Histology = study of tissues

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1 Tissues tissue = many cells w/ same structure and function cell shape aids function tissue shape aids function Histology = study of tissues

2

3 4 types of tissues Epithelial coverings contact openings Connective support connect other tissues Muscle movement contraction Nerve control conduct impulse

4 functions of epithelial tissues : protection prevent passage across epithelia permeability allows passage across epithelia lubrication of surfaces

5 characteristics of epithelia: contact opening free surface contacts the lumen lumen open space covers surfaces lines hollow tubes forms glands skin respiratory tract digestive tract urinary tract blood vessels

6 free surface opening epithelium

7 lumen epithelial tissue

8 lumen epithelial tissue

9 cellularity characteristics of epithelia:

10 cellularity

11 characteristics of epithelia: specialized contacts between cells tight junctions zona occludens seal between cell membranes p 70

12 desmosomes anchoring junctions hold cells together

13 characteristics of epithelia: polarity apical vs basal regions p 120

14 basal surface apical surface

15 characteristics of epithelia: support by connective tissue basement membrane basal lamina + reticular fibers

16

17 characteristics of epithelia: avascular no blood vessels regeneration active mitosis of stem cells

18 definitions simple = one layer stratified = many layers squamous = flat cuboid = box like columnar = tall

19 need a smooth tissue? simple squamous epithelium where? blood vessels = endothelium serous membranes

20

21 artery wall simple squamous epithelium

22 artery wall : simple squamous (endothelium) connective tissue and smooth muscle

23 need to exchange stuff? move stuff through the entire tissue thick or thin? thinnest tissue = simple squamous epithelium where? capillaries alveoli (lung) kidney

24 p 738

25 simple squamous smooth, thin

26

27 p 841

28 p 121

29 squamous cells viewed from the top :

30 need secretions? increase of what cell function? increase what part of cell? simple or stratified? simple cuboidal epithelium where? glands kidney

31

32 p 121

33 Thyroid gland cuboidal other text

34 p 126

35 kidney tubules simple cuboidal epithelium

36 Simple cuboidal epithelium (kidney tubules) Simple cuboidal epithelium Lumen of kidney tubule Nucleus Cuboidal cell

37 need secretion and absorption? need even more cytoplasm simple columnar epithelium why simple? where? stomach intestines

38 p 122

39

40 need to move stuff past the cell? cilia ciliated columnar epithelium pseudostratified ciliated columnar epithelium where? respiratory tract trachea fallopian tube

41 p 122

42 Pseudostratified epithelium (trachea) Cilia Pseudostratified epithelium Nuclei of epithelial cells

43 pseudostratified ciliated columnar epithelium

44 need to increase the surface area? microvilli intestines kidney brush border vs. cilia! p 70

45 simple columnar epithelium - with microvilli other

46 Simple columnar epithelium Nucleus of columnar cell Columnar cell Simple columnar epithelium microvilli Goblet cell

47 need protection? thick or thin? stratified squamous epithelium where? skin mouth esophagus rectum vagina

48 other

49

50 Stratified squamous epithelium (esophagus) Squamous cell Nuclei Stratified squamous epithelium

51 need a stretch? transitional epithelium stratified becomes simple many cuboidal layers can become squamous where? urinary bladder ureter

52 p 124

53 transitional epithelium other text

54 Glandular epithelium produce and secrete where they secrete to : exocrine secrete into ducts ducts to epithelial surfaces endocrine secrete into blood no ducts hormones

55 exocrine glands unicellular Goblet cells secrete mucus intestines respiratory tract

56 exocrine glands multicellular sweat glands sebaceous glands digestive glands mammary glands gland ducts simple cuboidal epithelium simple or stratified cuboidal epithelium

57 p 126

58

59 typical cross sections through glands ; ducts

60

61 other

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