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BIO 446L QUIZ 1 CH 4 QUESTIONS AND CORRECT ANSWERS
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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...

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  • August 16, 2024
  • 9
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • bio 446l quiz 1 ch 4 questions and correct answers
  • anything that enters or leaves the body must pass
  • describe the 2 surfaces of epithelium purpose h

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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

Types of adhesion/ anchoring intercellular junctions ✅1. Zonula adherens/ anchoring
2. Desmosome (macula adherens)
3. Hemidesmosomes

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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