1. The Task of Transportation

2. Most multi cellular organisms have a circulatory system- why is it needed?
1 carry O2/nutrients to cells; remove CO2/ wastes
2 transport chemical messages
3 distribute heat
4 help maintain a fluid balance
** Every cell in our body is within 2 cells of a blood vessel.**

3. A Vascular System (A system of vessels)
They can be Open or Closed

4. A Vascular System (A system of vessels)
Open
- blood is not confined to vessels
- blood bathes cells
- low pressure system
- eg. Crustaceans & insects

5. • Closed Systems
- blood is confined to vessels
- associated with some type of pump
(simple aorta in worms to 4-chambered heart)
- eg. Worms, fish, frogs, mammals

6. A Vascular System (A system of vessels)

7. A Vascular System (A system of vessels)
includes the medium is needed to carry nutrients (hemolymph in insects, blood)
specialized structures can be associated (cavities, aortas, hearts-2, 3, 4 chambered)

8. Insect Circulation

9. Worm Circulation

10. Fish Circulation Two chambered -one atrium, one ventricle
-single circulation-heart, gills, body, back to the heart.

11. Frog Circulation

12. Mammal Circulation

14. Three Chambered Heart Four Chambered Heart
Incomplete Double circulation (heart to lungs to heart to body)
-mixing of blood (poor O2 with rich O2 )
less O2 delivered
Four Chambered Heart
Complete double circulation
-No mixing of O2 poor/ O2 rich blood
- more efficient nutrient transport

15. Mass (grams) pulse rate (beats/minute)
mouse
rat
guinea pig
rabbit
small dog
large dog
man
horse
Elephant

16. Assignment
1. Create a chart that examines the range of circulatory systems from single celled amoebas to humans. Indicate the type of system (open, closed), the medium, and indicate specialized structures or pumps associated with it. Include the following organisms in your chart:
Single cells (amoeba) Insects (grasshopper)
Annelids (worms) Fish
Amphibians (frogs) Mammal (humans)
Birds

17. Associated structures
Organism
Type of System
Medium
Associated structures
Amoeba
Insect
Annelids (worms)
Fish
Amphibians
Mammal/Bird