Multiple choice

Which of the following reptiles has a four chambered heart?

  1. Snake

  2. Lizard

  3. Crocodile

  4. Turtle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Crocodiles are unique among reptiles in possessing a four-chambered heart. Most reptiles have three-chambered hearts (two atria, one ventricle) with partial mixing of oxygenated and deoxygenated blood. The crocodile's four-chambered heart, along with specialized valves, allows them to shunt blood away from lungs when diving and improve oxygenation efficiency when surfacing. Snakes, lizards, and turtles all have the typical three-chambered reptilian heart.

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