BIOB33 LECTURE 2 EXAM QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS VERIFIED
Adhering Junction
Junction that attaches one cell to another
Tight (Occluding) Junction
Junction at the apex that completely encircles cells brining plasmalemmae of adjacent
cells together with interlocking membrane proteins (ex. small intestine)
anchoring junction
Junction that either mechanically links two adjacent cells at their lateral surfacrs or link
epidermal cell to the basal lamina. Linkcage occurs via cell adhesion molecules (CAMS)
which bind to each other and to othet extracellular materials & proteoglycans that link
the opposing membranes and form a junction with the cytoskeleton within the adjoining
cells
Zonae adherens (adhesion belt)
A sheet-like anchoring junction that stabilizes non-epithelial cells; has a terminal web
Macula Adherens (Desmosome)
Small localized spot-like anchoring junctions that stabilize adjacent epidermal cells with
each cell contributing half of the snap
Hemidesmosome
Macula adherens that anchors intermediate filaments in a cell to the basal lamina
Communicating (Gap) Junction
, Channels found in the middle between the base and apex of the cell; built by
connexions that consist of 6 transmembrane proteins artanged into a circle to form a
tiny fluid filled tunnel or pore so that cells can communicate between themselves
Integumentary system
System composed of skin, hair, nails, sweat glands, oil glands and mammary glands
Epidermis
region that deals with friction (1-2 dimes thick), thickest on soles of feet and thinnest
behind the ears and eyelids; derived from the ectoderm germinal layer
stratum basale (stratum germinativum)
Deepest layer of skin made up of single layer of cuboidal cells which divide rapidly to
produce the cell layers above (moves superficially toward skin surface); contains
melanocytes and Merkel cells
Melanocytes
Produces melanin that are taken by melanosomes to various deepness of the skin;
everyone has an even number to begin with
Moles (nevus)
Concentrated areas of melanosomes; localized overgrowths of melanin- forming cells
Melanin
Pigment produced from melanocytes. Protects the underlying dermis from UV rays
Merkel cells
Touch receptors in the skin; releases chemicals towards the nerve endings (tactile
discs)
stratum spinosum (spiny layer)
COMPLETE SOLUTIONS VERIFIED
Adhering Junction
Junction that attaches one cell to another
Tight (Occluding) Junction
Junction at the apex that completely encircles cells brining plasmalemmae of adjacent
cells together with interlocking membrane proteins (ex. small intestine)
anchoring junction
Junction that either mechanically links two adjacent cells at their lateral surfacrs or link
epidermal cell to the basal lamina. Linkcage occurs via cell adhesion molecules (CAMS)
which bind to each other and to othet extracellular materials & proteoglycans that link
the opposing membranes and form a junction with the cytoskeleton within the adjoining
cells
Zonae adherens (adhesion belt)
A sheet-like anchoring junction that stabilizes non-epithelial cells; has a terminal web
Macula Adherens (Desmosome)
Small localized spot-like anchoring junctions that stabilize adjacent epidermal cells with
each cell contributing half of the snap
Hemidesmosome
Macula adherens that anchors intermediate filaments in a cell to the basal lamina
Communicating (Gap) Junction
, Channels found in the middle between the base and apex of the cell; built by
connexions that consist of 6 transmembrane proteins artanged into a circle to form a
tiny fluid filled tunnel or pore so that cells can communicate between themselves
Integumentary system
System composed of skin, hair, nails, sweat glands, oil glands and mammary glands
Epidermis
region that deals with friction (1-2 dimes thick), thickest on soles of feet and thinnest
behind the ears and eyelids; derived from the ectoderm germinal layer
stratum basale (stratum germinativum)
Deepest layer of skin made up of single layer of cuboidal cells which divide rapidly to
produce the cell layers above (moves superficially toward skin surface); contains
melanocytes and Merkel cells
Melanocytes
Produces melanin that are taken by melanosomes to various deepness of the skin;
everyone has an even number to begin with
Moles (nevus)
Concentrated areas of melanosomes; localized overgrowths of melanin- forming cells
Melanin
Pigment produced from melanocytes. Protects the underlying dermis from UV rays
Merkel cells
Touch receptors in the skin; releases chemicals towards the nerve endings (tactile
discs)
stratum spinosum (spiny layer)
