Multiple choice

The flow of blood in a fish having two chambered heart is called

  1. single circulation

  2. triple circulation

  3. double circulation

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fish have two-chambered hearts (one atrium, one ventricle) and single circulation. Blood passes through the heart once in a complete circuit: heart → gills → body → back to heart. This is less efficient than double circulation but adequate for their aquatic lifestyle.

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