Select the best answer for the question.
7. Fish respiratory systems exchange gas and receive oxygen at the gills. This oxygen then enters the blood stream and is pumped through the heart and back through the gills without first returning to the heart. This order of events best describes which type of circulation system?
A. Recycling
B. Open
C. Double loop
D. Single loop
Answer (2)
Fish have a single loop circulatory system where blood flows from the heart to the gills and then directly to the body, without returning to the heart first. This system is efficient for gas exchange in aquatic organisms. Therefore, the correct answer is a single loop circulation system. ;
Fish have a single loop circulatory system where blood flows from the heart to the gills and then directly to the body without returning to the heart first. This system is efficient for oxygen exchange in aquatic organisms. Hence, the correct answer is D. Single loop.
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