Multiple choice

Which amongst the following have a single circulatory system?

  1. humans

  2. fishes

  3. amphibians

  4. birds
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fish have a single circulatory system where blood passes through the heart only once in one complete circuit around the body. The heart has two chambers (one atrium, one ventricle) and blood travels from heart → gills → body tissues → back to heart. Humans, amphibians, birds, and mammals all have double circulation (pulmonary + systemic circuits).

Keep practicing — related questions