Which statement is true?

Question

BlackTom AI · Accepted Answer

Body composition refers to the proportions of fat mass and fat-free mass (muscle, bone, organs, water) in the body; thus measuring body fat percentage directly addresses composition.

1) Relevant knowledge points and concepts
- Body weight is the total mass (fat + lean). It does not distinguish tissue types.
- Body fat percentage quantifies the proportion of total mass that is adipose tissue, which is the standard metric for body composition.
- Common body-fat measurement methods: DEXA, hydrostatic weighing, skinfold calipers, bioelectrical impedance; each varies in accuracy and practicality.

2) Step-by-step reasoning
- If two people have the same body weight, but different fat percentages, their health and composition differ even though weight is identical.
- Therefore, a single number for weight cannot reveal proportions of fat vs. lean tissue; body fat percentage can.

3) Example calculation (intermediate steps shown)
- Person A: weight = 80 kg, body fat = 25%
  - Fat mass = 80 kg × 0.25 = 20.0 kg
  - Lean mass = 80 − 20 = 60.0 kg
- Person B: weight = 80 kg, body fat = 15%
  - Fat mass = 80 × 0.15 = 12.0 kg
  - Lean mass = 80 − 12 = 68.0 kg
- Same weight (80 kg) but very different fat and lean masses, demonstrating weight alone hides composition.

4) Why the correct answer is correct
- Because body composition is specifically the ratio of fat to nonfat tissues, a measurement that quantifies body fat percentage directly represents composition; total body weight cannot distinguish tissue types and so is a less accurate measure of composition.

5) Why the other options are incorrect
- "Body weight measurements differentiate between overweight and overfat." Incorrect: weight can indicate overweight by BMI rules but cannot determine if excess weight is fat or muscle (overfat status).
- "Body fat is easier to measure than body weight is." Incorrect: body fat requires specialized techniques; body weight is simpler to measure with a scale.
- "Body weight, rather than body fat, is the more accurate measure of body composition." Incorrect: weight is a composite measure and does not reveal proportions—thus less accurate for composition.

6) Conclusion
- The correct statement is: "Body fat is a more accurate measure of body composition than body weight is." This matches the provided answer.

Which statement is true?单项选择题

类似问题

According to experts, a percentage of body fat below the range of ________ is unhealthy.

Waist circumference is an accurate way of calculating percent body fat.

3. The speaker seems most disappointed about:

2. A typical flying car costs about Answer Question 2[input] times more than a regular car.

Listen to this mini-lecture about flying cars, and answer the following questions. Questions 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Car batteries would need to provide Answer Question 1[input] times more energy for a flying car.

Choose A, B, C or D as the best answer.30. The author’s main argument is that __________.

What does the underlined word in the text refer to?Write ONE WORD from the text to complete the sentences.24. ‘which’ in paragraph 5 refers to Answer Question 12[input].

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单