BIO 446L QUIZ 1 CH 4 QUESTIONS AND CORRECT ANSWERS
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Course
BIO 446
Institution
BIO 446
Anything that enters or leaves the body must pass through an ___ epithelium
Describe the 2 surfaces of epithelium & purpose Have a free surface which is exposed to external or internal space and a basal surface which is attached to a basal lamina (basement membrane)-- attaches to other tissues suc...
BIO 446L QUIZ 1 CH 4 QUESTIONS AND
CORRECT ANSWERS
Anything that enters or leaves the body must pass through an ___ ✅epithelium
Describe the 2 surfaces of epithelium & purpose ✅Have a free surface which is
exposed to external or internal space and a basal surface which is attached to a basal
lamina (basement membrane)-- attaches to other tissues such as connective and
muscle below it
Why epithelium avascular ✅prevents blood from being lost through the blood
uncontrollably
why is it important for epithelium to have nerve supply ✅recognizes touch, pain, and
sensory messages
Functions of Epithelia ✅• Mechanical protection
• Absorption
• Secretion of materials
• Lubrication of surfaces
• Formation of a surface for diffusion
• Transportation, excretion
• Sensory reception
• reproduction
Functions of Epithelia: Mechanical protection ✅protect body form outside world,
protect digestive enzymes
Functions of Epithelia: Absorption ✅like food, water, molecules, nutrients
Functions of Epithelia: Formation of a surface for diffusion ✅lungs x bv x oxygen
Functions of Epithelia: secretion of materials ✅acids to break down things, tears,
sweat
What are the 2 types of epithelia ✅1. covering
2. glandular
lamina propria- what is it and where is it located ✅loose connective tissue adjacent to
epithelium (in areas that are inside the body such as mouth, digestive tube, trachea)
basement membrane function ✅- attaches epithelium to connective tissue (or lamina
proper)
, - surface for mitosis
- controls diffusion to epithelium
Almost all epithelial cells rest on ___ tissue ✅connective tissue
internal organs (e.g. digestive, respiratory and urinary systems) rest on a connective
tissue termed the laminapropria
connective tissue of internal organs is called ✅lamina propia
outer later in the connective tissue form ___ for what fuction ✅microvilli or papillae to
increase surface area to anchor tissues together better (more SA to attach) as well as
get blood vessels into tissues to supply nutrients
Basement membrane ✅junction of the 2 laminae (basal and reticular) that connects
epithelium to connective tissue
Basal lamina is composed of ✅Type IV collagen, glycoproteins (laminin and entactin),
and proteoglycans
Laminin ✅These are large glycoproteins that attach to transmembrane integrinproteins
in the basal cell membrane and project through the mesh formed by the type IV
collagen.
Basal lamina binds with ✅(Type IV collagen) Binds epithelial cells of basal surface to
underlying connective tissue of BL using hemidesmosomes to do so
Reticular Lamina is located/ synthesized in ✅the connective tissue/ lamina proper
Reticular Lamina is made up of ✅Made of Type III collagen and connecting collagen
epithelial cells are bound together through ✅intercellular junctions
How are basal lamina and reticular lamina connected ✅by anchoring fibrils of type VII
collagen
Zonula adherens Intercellular adhesion Junction function ✅- directly below tight
junctions
- tie cells together like glue with actin to hold them up
- Connects cytoskeleton (using actin filaments) of one cell to another
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