Transcript CIRCULATION - Cayetano Heredia University

CIRCULATION
THE PROBLEM
• INTERNAL TRANSPORT
– Gases
– Nutrients, Wastes
– Hormones
• Rate of Diffusion
– Q = DA (C1 - C2)
X
THE SOLUTION:
PATTERNS OF
CIRCULATION
No Specific Structures
Open Circulation
Closed Circulation
THE GAME PLAN....
REDUCE DISTANCE FOR DIFFUSION
MAXIMIZE SURFACE AREA
Q = DA (C1-C2)
X
How to circulate substances?
No Specialized Circulatory System
Porifera
Porifera
Life style
Distance for diffusion
Area for diffusion
Habitat
No Specialized Circulatory System
Cnidaria
Gastrovascular Cavity
Life style
Distance for diffusion
Area for diffusion
Habitat
No Specialized Circulatory System
Platyhelminthes
Gastrovascular Cavity
Surface area
Distance for diffusion
Life Style
Habitat
OPEN CIRCULATORY SYSTEM
Mollusca
OPEN CIRCULATORY SYSTEM
Arthropoda
OPEN CIRCULATORY SYSTEM
CHORDATA: TUNICATE
CLOSED SYSTEM
Annelida
Squid, Octopus
Vertebrates
Mammalian Circulation
• A main propulsive organ which forces blood
around the body.
• Arterial system which acts to distribute
blood and to maintain pressure.
• Capillaries in which transfer between blood
and tissues occurs.
• Venous system which acts as a blood
volume reservoir and as a way to return
blood to heart.