234227019 circulatia-sangelui
Transcript of 234227019 circulatia-sangelui
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CIRCULATIA CIRCULATIA SANGELUISANGELUI
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CIRCULATIA SANGELUICIRCULATIA SANGELUI
- se datoreaza proprietatii miocardului de a se contracta
- este
- DUBLA
- INCHISA
- COMPLETA
( sangele trece de doua ori prin inima)
( sangele circula printr-un sistem inchis de vase)
( sangele oxigenat nu se amesteca cu cel
neoxigenat)
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CIRCULATIA MICACIRCULATIA MICA
CIRCULATIA MARECIRCULATIA MARE
CIRCULATIA PRIN VASELE CIRCULATIA PRIN VASELE DE SANGEDE SANGE
1
2
3
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ventricul drept artera aorta
artera pulmonara
plaman
vena cava
vene pulmonare
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1. Circulatia mica 1. Circulatia mica - se mai numeste si circulatie pulmonara deoarece sangele
parcurge urmatorul traseu :
PLAMANIINIMA
- dureaza 11 secunde;
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VDsange
neoxigenat
artera
pulmonara
PLAMANI
se incarca cu venit de la inima CO2
cedeaza sangelui O2
sange
oxigenat
vene pulmonare
AS
Circulatia mica se realizeaza astfel:Circulatia mica se realizeaza astfel:
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artera aorta
Vene pulmonare
artera pulmonara
Vene
pulmonare
vena cava inferioara
vena cava superioara
AD
VD
AS
VS
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INIMA ORGANE
2. Circulatia mare 2. Circulatia mare
- se mai numeste si circulatie sistemica deoarece sangele
parcurge urmatorul traseu :
- dureaza 22 de secunde;
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Circulatia mare se realizeaza astfel:Circulatia mare se realizeaza astfel:
VSsange
oxigenat
artera
aortaORGANE
se incarca cu
cedeaza sangelui
sange
neoxigenat vene caveAD
- CO2 - produsi toxici
- O2oxidare
energie
- nutrienti
ADAS
VD VS
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3. Circulatia prin vasele de 3. Circulatia prin vasele de sangesange
- In artere sangele circula - cu viteza mare de la inima la organe
- datorita- contractiei ventriculelor care
imping sangele in artere
- presiunii sangelui
- elasticitatii peretilor arteriali
tunica externa
tunica
medie
tunica
interna
Tesut elastic
Muschii arteriali
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- In vene sangele circula:
- cu viteza mai mica decat in artere, de la periferie spre inima
- datorita
- fortei de contractie a inimii
- aspiratiei toracice
- fortei gravitationale
- prezentei valvulelor in venele membrelor
inferioare
tunica
interna
tunica
medie
tunica
externa
sectiune prin vena
sectiune prin vena tunica interna
tunica externa
tunica medie
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- in capilare sangele circula cu viteza redusa si are presiune foarte
scazuta, fapt care favorizeaza schimburile nutritive si gazoase
capilareartera vena
venulaarteriola
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Contractia fibrei musculare de tip cardiacContractia fibrei musculare de tip cardiac