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Circulatory System:
Purpose:
- To deliver O2 & nutrients to all the
cells of the body.
-To transport waste, produced by the
cells,to the gills and kidneys for
excretion.
-Examples of cellular waste:
-Carbon dioxide
-ammonia
Fish have:
1. Closed circulatory system
Contained in blood vessels
2. A 1 loop
system
3. A low
efficiency system
Why?
Clean and dirty blood mix
A fish’s 1 loop system is made up of:
Heart: pumps the blood
Arteries: carries blood away from
heart
Veins: carries blood to the heart
Capillaries: connects arteries to the
veins
-systemic (supply body)
-respiratory (supply gills)
Circulatory System
Pathway of Blood:
3
4
2
1
1. Heart pumps blood thru arteries to
capillaries in the gills
2. Blood picks up O2 & releases CO2
through the gills
3. From the gills the blood travels to
body tissues where nutrients & wastes
are exchanged
4. Blood goes back to heart thru veins
veins
gills
Heart
Gill capillaries
arteries
A Fish’s heart1. muscular pump that circulates blood around
body
2. Has 2 chambers
Atrium
(upper)
Ventricle
(lower)
Circulatory System:
2. Atrium
1. Sinus venosus
5. To gills
4. Bulbus arteriosus
3.Ventricle
Pathway thru HEART:
1. CO2 dirty blood returns from body to Sinus
Venosus (collection area)
2. To large Atrium
3. To muscular Ventricle (PUMP)
4. To Conus/Bulbus Arteriosus
~ saturated with blood vessels
-has valves to decrease backflow
5. To Aorta (large artery) to body
Circulatory System