Understanding the Aerobics Passage and Blank 5

The passage describes the positive effects of aerobics on the human body, specifically focusing on the heart and lungs. It explains how aerobics stimulates these organs to bring about beneficial changes. The changes mentioned include strengthening muscles, facilitating rapid airflow in and out of the lungs, and making the heart function in a way that allows it to pump more oxygen and blood.

We need to find the most appropriate word to fill in blank no. 5, which describes the heart in the context of it pumping more oxygen and blood.

Analyzing Options for Blank 5

Let's look at the provided options and see which one best fits the description of a heart capable of pumping more oxygen and blood as a result of exercise:

• Adequate: This means sufficient or satisfactory. While a basic level of adequacy is necessary, the passage describes an *improvement* in heart function, implying more than just 'adequate'.
• Skillful: This term is typically used for actions requiring ability or expertise, usually by a person. It doesn't fit as a description for an organ like the heart in this biological context.
• Efficient: This means functioning in the best possible manner with the least waste of time and effort. An efficient heart pumps more blood with each beat or pumps the required amount of blood more easily, delivering more oxygen where needed. This aligns well with the phrase "to pump more oxygen and blood".
• Trained: While aerobics *trains* the heart, describing the heart itself as "trained" in this sentence structure feels less natural or precise than describing the *quality* of its improved function. The exercise is the training process; the result is a more effective or efficient organ.

Determining the Best Fit for Blank 5

Considering the context that the heart is now able "to pump more oxygen and blood," the word that best describes this enhanced capability is "efficient". An efficient heart is capable of performing its function powerfully and effectively, which translates to pumping more vital resources like oxygen and blood throughout the body. This is a key beneficial change brought about by aerobic exercise.

Conclusion

Based on the analysis of the options and the context of the passage, the most appropriate word to fill in blank no. 5 is "efficient". It accurately describes the improved functional capacity of the heart after being stimulated by aerobic exercise.

The completed sentence fragment would be: "...a more efficient heart to pump more oxygen and blood."

Revision Table: Blank 5 Options

Additional Information: Aerobics and Heart Health

Aerobic exercise, also known as cardiovascular exercise, is any activity that increases your heart rate and breathing rate for a sustained period. These exercises are crucial for improving cardiorespiratory fitness. Regular aerobic exercise leads to several positive adaptations in the body, including:

• Stronger Heart Muscle: The heart becomes a more powerful pump.
• Increased Stroke Volume: The amount of blood pumped by the left ventricle in one contraction increases.
• Lower Resting Heart Rate: An efficient heart doesn't need to beat as often to pump the same amount of blood when at rest.
• Improved Circulation: Better blood flow throughout the body.
• Increased Oxygen Delivery: More oxygen is transported to the muscles and organs.

These changes collectively result in a more efficient cardiovascular system, which is why aerobic exercise is highly recommended for overall health and well-being.