Do marsupials have a four-chambered heart?

Do marsupials have a four-chambered heart?

• A. Yes
• B. No
• C. Sometimes
• D. Not specified

Answer: (A)

A four-chambered heart is how mammals, including marsupials, organize blood flow. Having two atria and two ventricles with complete separation between the chambers keeps the deoxygenated blood returning from the body on the right side and pumped to the lungs, while the oxygenated blood from the lungs is kept on the left side and pumped to the rest of the body. This arrangement prevents mixing of the two blood streams and supports efficient, high-demand metabolism that characterizes mammals. Marsupials share this four-chambered design with other mammals, so their hearts have two atria and two ventricles that are fully separated.

A four-chambered heart is how mammals, including marsupials, organize blood flow. Having two atria and two ventricles with complete separation between the chambers keeps the deoxygenated blood returning from the body on the right side and pumped to the lungs, while the oxygenated blood from the lungs is kept on the left side and pumped to the rest of the body. This arrangement prevents mixing of the two blood streams and supports efficient, high-demand metabolism that characterizes mammals. Marsupials share this four-chambered design with other mammals, so their hearts have two atria and two ventricles that are fully separated.