Histology

Question 1

Tight Junctions

Answer 1

gate/fence function, cells at the tight junction appear fused

Question 2

Adherens Junction

Answer 2

cadherins link the cell together, connected to actin filaments in cell, involved in tissue morphogenesis and cell-cell communication

Question 3

Desmosome

Answer 3

adhesion molecule is cadherins,associates with keratin intermediate filaments, involved with cell-cell adhesion and signalling

Question 4

Gap Junction

Answer 4

6 connexins make one connexon, allows the passage of small molecules from cell to cell such as ions, sugars, amino acids and nucleotides

Question 5

Hemidesmosomes

Answer 5

link epithelial cells to the BM, attached to keratin, involved in signalling and cell adhesion

Question 6

Microvilli

Answer 6

found on simple columnar, referred to as brush border, found in gut tissue, arise from terminal web of actin, important for absorption

Question 7

Cilia

Answer 7

microtubule arrangement, found in airways, arise from basal bodies

Question 8

Stereocilia

Answer 8

thin long extensions of the apical surface and contain actin filaments at their core

Question 9

Special connective tissue

Answer 9

cartilage, bone, fat, blood

Question 10

Collagen

Answer 10

1 alpha chain–>3 alpha chains–>fibril–>fiber–>parallel arrays, patches, and meshwork

Vitamin C is required for hydrogen bonds to form between alpha chains

Triple Helix formed from C to N terminal

Collagen molecule assemble head to tail

Question 11

Serous Acini

Mucous Acini

Answer 11

Nuclei are central, clusters of secretory cells filled with dark staining granules

Nuclei are flattened and displaced to the basal aspect of the cell near the surface of the acini