Chapter 19 Blood vessels post

Chapter 19 Blood vessels post - Chapter19...

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Chapter 19 The Cardiovascular System:  Blood Vessels Ray Thompson, PhD
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2 The Blood Vessels Fo rm  a  c lo s e d  s ys te m 3 major types:      1. Arte ry      2. C apillary      3. Ve in C a rrie s  b lo o d a wa y  fro m  he a rt C a rrie s  b lo o d to wa rds   the  he a rt Exc ha ng e  nutrie nts  a nd  wa s te Part I: Vessel Structure
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3 Generalized Structure of Blood Vessels Figure 19.1b Ve s s e ls  are  m a de  o f 3 tunic s Tunic a  intim a  – line s  lum e n wa ll Tunic a  m e dia  – thic ke s t la ye r Tunic a  e xte rna  – o ute rm o s t laye r S im ple  s q ua m o us  e ndo the lia l la ye r      Fo rm s  s m o o th la ye r (  fric tio n) Ve s s e ls  >1m m  dia m e te r      S ube ndo the lia l la ye r – b a s e m e nt  m e m b ra ne S m o o th m us c le  a nd e la s tin  c o nne c tive  tis s ue Va s o c o ns tric t o r Va s o dila te      re g ula te d b y va s o m o to r ne rve   fro m  ANS Lo o s e  c o lla g e n  c o nne c tive  tis s ue Ne rve s  a nd lym ph  ve s s e ls Va s a  va s o rum  –      ve s s e ls  o f the  ve s s e ls
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4 http://www.rci.rutgers.edu/~uzwiak/AnatPhys/Blood_Vessels_files/image002.jpg Tunica Externa Tunica Media Tunica Intima
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5 Vas c ula r C o m po ne nts Figure 19.2a, b alte rnate  pa thways  (c o lla te ral c ha nne ls ) Tho ro ug hfare  c ha nne ls  are  e xam ple s  o f  arte rio ve no us  a nas to m o s e s Anas to m o s e s a ne two rk o f s tre a m s  tha t  bo th b ranc h o ut and  re c o nne c t
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6 Blood Vessel Anatomy Table 19.1 Elastic (Conducting) Arteries Thic k-wa lle d a rte rie s  ne a r the  he a rt;  Large lumen - low-resistance to flow Contain elastin in all three tunics Smooth out large blood pressure fluctuations  Serve as pressure reservoirs Muscular arteries   – dis ta l to  e la s tic  a rte rie s ; de live r b lo o d  to  bo dy o rg a ns Ha ve  thic k tunic a  m e dia  with m o re  s m o o th m us c le Ac tive  in va s o c o ns tric tio n Arterioles  – s m a lle s t a rte rie s ; le a d to  c a pilla ry b e ds C o ntro l flo w into  c a pilla ry b e ds  ( re s is ta nc e  ve s s e ls ) Capillaries  - the  s m a lle s t b lo o d ve s s e ls   Wa lls  - thin tunic a  inte rna , o ne  c e ll thic k Allo w o nly a  s ing le  RBC  to  pa s s  a t a  tim e   Pe ric yte s  o n o ute r s urfa c e  s ta b ilize  c a pilla ry wa lls 3 s truc tura l type s : c o ntinuo us , fe ne s tra te d, a nd s inus o ids
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7 Continuous Capillaries Abundant in the skin and muscles Endo the lia l c e lls  pro vide  uninte rrupte d lining Adjac e nt c e lls  a re  c o nne c te d with tig ht junc tio ns Inte rc e llular c le fts  allo w the  pa s s a g e  o f fluids
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This note was uploaded on 01/10/2012 for the course EXSC 224 taught by Professor Thomson during the Fall '07 term at South Carolina.

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Chapter 19 Blood vessels post - Chapter19...

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