Which of the following best explains the difference in muscle volume between untrained horses and trained race horses?

Question

Which of the following best explains the difference in muscle volume between untrained horses and trained race horses?





Trained race horses use muscles more often than untrained horses, therefore, muscle volume is greater

Trained race horses require less muscle volume to achieve the same energy efficiency as untrained horses

Muscle volume is greater for trained race horses to make up for a lower respiratory volume compared to untrained horses

Muscle volume is less for trained race horses because cardiac output requires the muscles to work harder than untrained horses

Answer 1

The first option, "Trained race horses use muscles more often than untrained horses, therefore, muscle volume is greater," best explains the difference in muscle volume between untrained horses and trained race horses. Trained race horses engage in regular intense exercise and training that stimulates muscle growth and development, leading to an increase in muscle volume.