Question

Which statement is correct with respect to the heart in fishes?

• A. Only pure blood passes through it
• B. Only impure blood passes through it
• C. Both pure and impure blood can pass through it
• D. Blood does not enter the heart

Answer 1

Answer: (B)

Only impure blood passes through it

Fishes have the simplest type of true heart, a two-chambered organ composed of one atrium and one ventricle.
The impure blood enters the heart and is pumped to the gills for purification. From gills, the purified blood is sent directly to the body.
So, the correct answer is option B.