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BIOS 255 Week 8 Comprehensive Exam Study Guide/A&P 3 Comprehensive Study Guide
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BIOS 255 Week 8 Comprehensive Exam Study Guide/A&P 3 Comprehensive Study Guide
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BIO255Comprehensive Exam
Study Guide
50 Multiple Choice Questions
100 points total
ANATOMY & PHYSIOLOGY
3
, Feedback Systems
Negative feedback
Blood A Process Which the body senses a and
pressure
In
change
example activates mechanisms that reverse it .
Keeps a variable closeto its set point
At Negative feedback opposes original stimulus☒
MOST COMMON feedback loop
→ in the body →
Examples of negative feedback 100ps
÷::÷÷÷::+i¥ Blood sugar regulation
ihropos.it
self
ive feedback
¥IuP0nenIse%9Ef%Ft9¥¥Éecto#nm
amplifying cycle in which a physiological change
-
leads to an even greater change in the same direction
→
Positive feedback IrinaÑcesoriginal Stimulus
l l l t'
Examples of positive feedback 100ps
:÷:÷÷¥
Blood clotting
, m Epithelial Tissue w
Epithelial tissue consists of a sheet of closely adhering cells, one or more cells
thick, with the upper surface usually exposed to the environment or to an
internal space in the body. Epithelium covers the body surface, lines body
cavities, forms the external and internal linings of many organs, and
constitutes most gland tissue.
Epithelia are avascular
(without blood vessels)
—there is no room for
them bet ween the cells.
Epithelia, however,
usually lie on a vessel-
rich layer of connective
tissue, which furnishes
them with nutrients
r
and waste removal
{ Name tissue type
by class first cell
,
÷÷:÷:÷÷÷÷÷LTiEpithelialtissueishg
shape second
basement membrane that serves as
layer beneath
highly regenerative
polarizedno
Epithelial cells establish an apical-basial polarity which
results from the differential distribution of phospholipids,
proteins complexes, and cytoskeletal components bet ween
the various plasma membrane domains reflecting their
specialized functions
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