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In an open type circulatory system, the blood pumped by the heart flows into body spaces rather than continuous vessels. These spaces are collectively called what?
APericardium
BHaemocoel
CCapillaries
DVentricles
Answer & Solution
Correct answer: B. Haemocoel
1. In open circulation the heart pumps blood into open body spaces rather than closed vessels.
2. These spaces are sinuses, and the whole cavity is the body cavity of the animal.
3. Option A (pericardium) is the protective sac around the heart, not a blood space, so it is a trap.
4. Option C (capillaries) belong to the closed circulatory system, the opposite of open type.
5. Option D (ventricles) are chambers inside the heart, not the surrounding cavity.
6. The blood-filled body cavity of an open system is called the haemocoel.
7. So the answer is option B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 14 Transportation in Plants and Circulation in Animals "Open type", p.214_
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