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BIOLOGY, M2 EQ-Bank 1

Compare and contrast open and closed circulatory systems. In your answer, describe one advantage of each system, providing an example of an organism with each type of circulatory system.   (4 marks)

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→ An open circulatory system has blood flowing freely in body cavities, while a closed circulatory system contains blood within vessels throughout its journey.

→ An advantage of an open system is its simplicity and low energy requirement, while a closed system allows for more efficient and rapid distribution of materials.

→ Closed systems are necessary in larger animals because they can maintain higher blood pressures, allowing for more efficient oxygen delivery to tissues far from the heart.

→ Insects (eg. grasshoppers) have an open circulatory system, while mammals (eg. humans) have a closed circulatory system.

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→ An open circulatory system has blood flowing freely in body cavities, while a closed circulatory system contains blood within vessels throughout its journey.

→ An advantage of an open system is its simplicity and low energy requirement, while a closed system allows for more efficient and rapid distribution of materials.

→ Closed systems are necessary in larger animals because they can maintain higher blood pressures, allowing for more efficient oxygen delivery to tissues far from the heart.

→ Insects (eg. grasshoppers) have an open circulatory system, while mammals (eg. humans) have a closed circulatory system.

BIOLOGY, M2 EQ-Bank 1 MC

Which of the following is a characteristic of an open circulatory system?

  1. Blood is always contained within blood vessels.
  2. It is typically found in larger, more complex animals.
  3. Hemolymph bathes organs directly in body cavities.
  4. It allows for rapid, high-pressure blood flow.
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\(C\)

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→ In an open circulatory system, the circulatory fluid (hemolymph) is not always confined within blood vessels but instead bathes organs directly in body cavities. 

\(\Rightarrow C\)