6 Questions
Explain the difference between circulation in simple organisms and complex organisms.
Simple organisms like sponges and coelenterates use water from their surroundings for circulation, while complex organisms use body fluids like blood and lymph for circulation.
How do arthropods and molluscs circulate blood in their bodies?
Arthropods and molluscs circulate blood by pumping it through the heart, which then passes through large vessels into open spaces or cavities called sinuses.
What advantage does circulating blood through vessels provide?
Circulating blood through vessels is more advantageous as the flow of fluid can be precisely regulated, unlike in organisms that pump blood into sinuses.
How do simple organisms like sponges and coelenterates primarily circulate nutrients and gases?
Using water from their surroundings
In what way do arthropods and molluscs circulate blood in their bodies?
Blood pumped by the heart passes through large vessels into sinuses
What advantage does circulating blood through vessels provide in complex organisms?
Precise regulation of fluid flow
Study Notes
Circulation
- Circulation is the transport of nutrients, oxygen, CO2, and excretory products to tissues or organs
- Simple organisms (sponges, coelenterates) use surrounding water for circulation
Circulation in Complex Organisms
- Complex organisms use body fluids (blood & lymph) for circulation
- Blood pumped by the heart passes through large vessels into open spaces (sinuses) in some complex organisms (e.g. Arthropods, molluscs)
- In more advanced circulation systems, blood pumped by the heart is circulated through blood vessels
- This system is more advantageous as the flow of fluid can be precisely regulated
Test your knowledge of circulation in organisms with this quiz. Explore how simple and complex organisms use water or body fluids for circulation, and learn about the different mechanisms involved.
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