1. 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

2. Fish have: 1. Closed circulatory system Contained in blood vessels
2. A 1 loop
system

3. Clean and dirty blood mix
3. A low efficiency system
Why?
Clean and dirty blood mix

4. 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)

5. Circulatory System

6. Pathway of Blood: 3 4 2 1
Heart pumps blood thru arteries to capillaries in the gills
Blood picks up O2 & releases CO2 through the gills
From the gills the blood travels to body tissues where nutrients & wastes are exchanged
Blood goes back to heart thru veins

7. veins
gills
Heart
Gill capillaries
arteries

8. A Fish’s heart- 1. muscular pump that circulates blood around body
2. Has 2 chambers
Atrium
(upper)
Ventricle
(lower)

9. Circulatory System: 1. Sinus venosus 2. Atrium 5. To gills 3.Ventricle
4. Bulbus arteriosus

10. Pathway thru HEART:
CO2 dirty blood returns from body to Sinus Venosus (collection area)
To large Atrium
To muscular Ventricle (PUMP)
To Conus/Bulbus Arteriosus
~ saturated with blood vessels
-has valves to decrease backflow
5. To Aorta (large artery) to body

11. Circulatory System