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Edit View Insert Format Tools Table Window Help . ? ng: a cell Communities hr Design Layout ReferencesMailings Review View a: nes New Ro...12 uestions 1-3 use the epithela image on the right. 1. Identify the structures (A-D) on the image of epithela on the right A. Free surface B. Basal lamin C. D. Connective tissuc if a substance was added on the apical side of the epithelia, would you expect it to reach the basal lamina? Explain why or why not Although not shown on the image, where would you expect to find hemidesmosomes? How do they differ from desmosomes? D 3. Hemidcstoosotacs bind epithelial cells to the basal lamina 4. Match the Molecules with the Cell structures in which they are involved. A cell structure may be used more or less than once. Molecule A Cadherin B. Collagen C. Ossludins D. Cellulose Cell Structure 1. Gap junction 2 Basal lamina 3. Tight junction 4. Desmosames E. Connexcs 5. Cell Wall F Keratins G. Cellulose 6 Tight junction Question S uses the muhipotent hemonoletis stem cell image on the right 5. a. identity which cell is the sef-renewing stem cell. Sb. Identity which cels are proliferating precursor celsr

Explanation / Answer

1)

A-free surface

B-basal lamina

C-desmosomes(tight junctions)

D-connective tissue

-Free surface is seen at the apical surface,as the epithelial cells

Provide interspace for masses of cells and covering s lumen or spce.

-basal lamina is the specialised extracellular matrix around the cell,which allows it to sit in connective tissue.collectively it is called basement membrane,it has two parts

a)lumina lucids-closer to epithelial cells.

b)lumina densa-closer to connective tissue.

-Tight junctions or desmosomes seal the adjacenr epithelial cells at a narrow band just beneath the apical surace.These consist of claudins majorly,desmocollins etc..,

Main function are

These doesn't allow molecules into space between cells,so they must pass through cells by active transport.

a)receptor mediated endocytosis at apical surfaced

b)exocytosis at basolateral surface

Connective tissue acts as the base and supports the whole cells by blood and nutient supply and transfer of molecules.

3) hemidesmosomes are a type of junctions which are mostly seen in keratinocytes of the epidermis of skin,that attach to extracellular matrix.major difference is desmosomes attach to adjacent cells,but hemidesmosomes are found in basal area connecting basal epithelial cells to lumina lucida.

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