Question at position 3 Resting metabolism is determined by cellular energy production and is directly proportional to: Lean body massNumber of uncoupling proteinsNumber of adipocytesBody weight单项选择题
A
Lean body mass
B
Number of uncoupling proteins
C
Number of adipocytes
D
Body weight

Question

Question at position 3 Resting metabolism is determined by cellular energy production and is directly proportional to: Lean body massNumber of uncoupling proteinsNumber of adipocytesBody weight

BlackTom AI · Accepted Answer

Resting metabolic rate is most closely tied to the amount of metabolically active tissue, so it is directly proportional to lean body mass (fat‑free mass).

Relevant concepts:
- Resting (basal) metabolism reflects ATP use by cells at rest to maintain ionic gradients, protein turnover, organ function, and basic cellular processes.
- Different tissues have very different mass‑specific metabolic rates: organs (brain, liver, heart, kidneys) and skeletal muscle are highly metabolically active per kilogram, whereas adipose (fat) tissue has a much lower metabolic rate per kilogram.
- Lean body mass (fat‑free mass) includes the organs and muscles responsible for the bulk of resting energy expenditure, so changes in lean mass produce the largest changes in resting metabolism.

Step‑by‑step reasoning:
1. Identify the contributors to resting ATP demand: vital organs and skeletal muscle require continuous ATP; together these are part of lean body mass.
2. Recognize that per kilogram, organ and muscle tissue consume far more energy than adipose tissue. Therefore a kilogram of lean tissue raises resting energy needs much more than a kilogram of fat.
3. Thus, when lean body mass increases, the number of ATP‑consuming cells and mitochondria increases, raising resting metabolic rate in direct proportion to lean mass.
4. Conversely, increases in body weight due chiefly to fat do not raise resting metabolism proportionally because adipose is relatively inert metabolically.

Why the correct answer is correct:
Lean body mass specifically quantifies the metabolically active tissues that drive resting energy expenditure; therefore resting metabolism is directly proportional to lean body mass.

Why the other choices are incorrect:
- Number of uncoupling proteins: these modify mitochondrial efficiency and can alter thermogenesis but are not the primary determinant across individuals and are not directly proportional in the way lean mass is.
- Number of adipocytes: adipose has low mass‑specific metabolic activity, so adipocyte count is a poor predictor of resting metabolism.
- Body weight: includes fat mass and thus is a less accurate predictor than lean mass.

Final confirmation: the correct answer is Lean body mass.

Question at position 3 Resting metabolism is determined by cellular energy production and is directly proportional to: Lean body massNumber of uncoupling proteinsNumber of adipocytesBody weight单项选择题

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