How many chambers are there in the heart of fishes?

Question

Accepted Answer

Fishes (most bony and cartilaginous fishes) have a single-loop circulation and a heart composed of one atrium and one ventricle, giving a total of $2$ chambers.

Step-by-step:
1. Heart structure: 1 atrium + 1 ventricle = $2$ chambers.
2. Circulation: single circuit — heart → gills (oxygenation) → body → heart — compatible with a $2$-chambered heart.
3. Comparison: amphibians have $3$ chambers, mammals/birds have $4$, but typical fishes have $2$.

FINAL_ANSWER: b

Answer

Answer

Answer