Let me share with you a difference between open circulatory system and closed circulatory system.
| Aspect | Open Circulatory System | Closed Circulatory System |
| Type of fluid | Hemolymph | Blood |
| Presence of Vessels | · Few or no vessels · Hemolymph flows directly into body cavities (hemocoels) | · Well-defined vessels (arteries, veins, and capillaries) · Blood flows throughout the body through them. |
| Pressure rate | Lower pressure | Higher pressure |
| Transport of oxygen | Limited ability for targeted oxygen delivery | Efficient targeted oxygen delivery to tissues |
| Nutrient transport | Limited ability for nutrient delivery | Efficient nutrient delivery to tissues |
| Waste removal | Limited efficiency in removing waste products | Efficient removal of waste products |
| Advantages | Less energy-intensive and can adapt to variable oxygen demands | More efficient delivery of oxygen, nutrients and waste removal; allows for higher metabolic rates |
| Disadvantages | Less precise delivery of oxygen and nutrients and limited capacity for high metabolic rates | Requires more energy, thus less adaptable to variable oxygen demands |
| Examples
| · Insects · Mollusks
| · Mammals · Birds · Reptiles · Annelids · Cephalopods
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