Respiration_physiology_students-1

Respiration_physiology_students-1 - R e s p ira tio n: P h...

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Re s pira tio n:  Phys io lo g y Thre e  fo rc e s  invo lve d in b re a thing 1. To rq ue :  during  ins pira tio n, the  rib s   ha ve  b e e n e le va te d a nd twis te d (a t  c ho ndra l po rtio n).  Re le a s e  o f m us c ula r  pull (e nd o f ins pira tio n) c a us e s  rib s  to   unwind.  The  fo rc e  (to rq ue ) g e ne ra te d  c a us e s  a  re s to ra tio n fo rc e  (re turn to   ne utra l rib  po s itio n).   2. Ela s tic ity:  lung s  a re  hig hly e la s tic  a nd  ha ve  b e e n s tre tc he d during  inha la tio n  due  to  e xpa ns io n o f the  tho ra x.  Whe n  ins pira to ry m us c le s  s to p c o ntra c ting ,  the n lung s  wa nt to  re turn to  the ir re s ting   s ha pe  a nd s ize .
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1. G ra vity:  g ra vity a c ts  o n rib s  to  pull  the m  do wnwa rd (during  pa s s ive   e xha la tio n) a nd wo rks  o n a b do m ina l  vis c e ra  with a  do wnwa rd fo rc e  tha t  he lps  inc re a s e  the  a re a  fo r the  lung s   (during  inha la tio n). www.b e tte rhe a lth.vic .g o v.a u Lo o k in im a g e  lib ra ry fo r re s pira to ry  s ys te m . he a lth .ho ws tuffwo rks .c o m he a lth m e dic a l a nim a tio n b re a thing http://m c db .c o lo ra do .e du/c o urs e s /2115  units /o the r/rib c a g e % 20m o vie .m o v Anim a tio n o f rib  a nd dia phra g m   m o ve m e nts
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BREATHING Ins pira tio n:  Ac tive  c o ntra c tio n o f  dia phra g m , inte rc o s ta ls  a nd po s s ib ly  s c a le ne  m us c le s  e xpa nds  tho ra c ic  c a vity.   Lung s  thro ug h linka g e  to  tho ra x, e xpa nd  to o *.  Ne g a tive  pre s s . is  c re a te d in lung s ,  thus  a ir rus he s  in until intra -a lve o la r  pre s s ure  = to  a tm o s phe ric  pre s s ure .   Exha la tio n:  Mus c le s  o f inha la tio n c e a s e   to  c o ntra c t g ra dua lly (the y e xe rt fo rc e   during  e a rly pa rt o f e xpira tio n to  c he c k  re c o il o f lung s --like  re le a s ing  b ra ke ).  The   dila te d tho ra x-lung  c o m ple x g e ne ra te s   s lig htly po s itive  pre s s ure  a nd a ir is   e xha le d.  Re s to ring  fo rc e s  pro vide d b y  a b do m ina l c o nte nts  unde r pre s s ure , lung   e la s tic ity, a nd rib s  whic h ha ve  b e e n  e le va te d a nd twis te d will " unwind"  to   pro vide   torque .  The  e xpira to ry fo rc e s   a re  pa s s ive  o r no nm us c ula r during   pa s s ive  e xpira tio n.**
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Lung volumes : 1. Tida l vo lum e : (TV)  Vo l. o f a ir inha le d  a nd e xha le d during  a  s ing le  e xpira to ry  c yc le .  Va rie s  a c c o rding  to :* Adult m a le : 600c c  a t re s t 1670c c  lig ht wo rk 2030c c  he a vy wo rk Adult fe m a le :  450c c  a t re s t. 1.
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This note was uploaded on 05/16/2011 for the course SPA 3101 taught by Professor Carson,d during the Spring '08 term at University of Central Florida.

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Respiration_physiology_students-1 - R e s p ira tio n: P h...

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