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Double Circulation in Birds and Mammals

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Questions and Answers

What is the primary difference between the double circulation in birds and mammals compared to other vertebrates?

The heart has two atria and two completely divided ventricles (correct)

The heart has one atrium and one ventricle

The heart has three atria and two ventricles

The heart has four atria and four ventricles

What is the main reason why birds and mammals need a more efficient circulatory system?

They are endotherms and use more energy than ectotherms (correct)

They need to pump more blood to their lungs

They need to pump more oxygen-rich blood to their brains

They need to remove more CO2 and other wastes from their tissues

What is the term for the independent evolution of similar traits in different ancestors?

Parallel evolution

Co-evolution

Divergent evolution

Convergent evolution (correct)

How much more energy do birds and mammals use compared to equal-sized ectotherms?

Ten times as much Signup and view all the answers

What is the advantage of having separate and independently powered systemic and pulmonary circuits?

Large traffic of substances Signup and view all the answers

Why can't birds and mammals vary blood flow to the lungs without varying blood flow throughout the body?

Because their circulatory systems are linked Signup and view all the answers

What is the function of the left side of the heart in birds and mammals?

Receives and pumps oxygen-rich blood Signup and view all the answers

How do the circulatory systems of birds and mammals adapt to their high energy needs?

By having separate and independently powered systemic and pulmonary circuits Signup and view all the answers

What is a key feature of the heart in birds and mammals?

Two atria and two completely divided ventricles Signup and view all the answers

Why is a powerful four-chambered heart beneficial for birds and mammals?

It allows for more efficient oxygenation of the body Signup and view all the answers

What is similar between the circulatory systems of birds and mammals?

Their double circulation pattern Signup and view all the answers

What is the result of convergent evolution in birds and mammals?

Development of a powerful four-chambered heart Signup and view all the answers