Question

2. Discuss why a four chambered heart is more efficient than a two chambered heart in delivering oxygenated blood to the various body parts. What evolutionary changes in the lifestyles of organisms selected for the evolution of the four chambered heart?

Answer 1

As organisms became more active, a four-chambered heart was selected for because of its ability to separate oxygenated and deoxygenated blood.

Why is a four-chambered more efficient in oxygen delivery than a two-chambered heart?

A four-chambered heart is a heart consisting of four chambers, namely;

• upper ventricle
• lower ventricle
• upper atrium and
• lower atrium

A four-chambered heart is more efficient in oxygen delivery than a two-chambered heart because it does not allow for mixing of oxygenated and deoxygenated blood.

A more active lifestyle by organisms and larger body size selected for a four-chambered heart in organisms.

Therefore, the efficiency of a four-chambered heart is in it's ability to separate oxygenated and deoxygenated blood.

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