Question

How many chambers does a mammalian heart have?
1. 3
2. 4
3. 1
4. 2

Answer 1

Correct Answer - Option 2 : 4

The correct answer is 4.

• Mammal hearts have four chambers (two atria and two ventricles).

• In mammals and birds, the heart is divided into four chambers: two atria and two ventricles.

  • The oxygenated blood is separated from the deoxygenated blood, which improves the efficiency of double circulation and is probably required for the warm-blooded lifestyle of mammals and birds.
• Reptiles have a three-chambered heart – two atria and one partially divided ventricle.
  • There is a mixing of oxygenated and deoxygenated blood because the ventricle is not split completely.
• Pisces are aquatic animals, they belong to phylum Chordata, their heart is two-chambered, one auricle and one ventricle and there is the mixing of pure and impure blood takes place.