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Transport · Paper 1 — Free Biology SL Practice Questions
1FoundationMCQCirculatory systems: Open vs closed1 markPaper 1~2 min
In a grasshopper, the dorsal blood vessel pumps haemolymph into the haemocoel, where it bathes organs directly. Haemolymph re-enters the dorsal vessel through valved openings called ostia during relaxation. How does the pressure in the dorsal vessel compare to the pressure in the haemocoel at different phases of one contraction cycle?
Solutions
2MasteryMCQCirculatory systems: Open vs closed1 markPaper 1~2 min
A grasshopper has an open circulatory system and a fish has a closed circulatory system. Measurements show that the hydrostatic pressure in the main vessel leaving the heart is approximately equal in both animals. Which of the following best explains why the rate of oxygen delivery to the leg muscles is lower in the grasshopper than in the fish?
Solutions
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