15th Edition
Sizer + 3 others
ISBN: 9781337906371




15th Edition
Sizer + 3 others
ISBN: 9781337906371
Textbook Problem

Which of the following statements about basal metabolic rate (BMR) is correct?

  1. The greater a person's ago, the higher the BMR.
  2. The more thyroxine produced, the higher the BMR.
  3. Fever lowers the BMR.
  4. Pregnancy lowers the BMR.

Summary Introduction


BMR or basal metabolic rate is defined as the rate of expanded energy per unit time by an endothermic animal at the state of rest. It shows the energy amount per unit time, which is used by a person for the proper functioning of the body at rest. Factors affecting BMR include body size, weight, muscle mass, body temperature, and gender. Thyroid hormone is responsible for regulation and maintenance of BMR.


Justify reason for the correct answer:

Option (b) is given as ‘more the thyroxine is produced, higher the BMR’. The thyroid gland is responsible for secreting two hormones T3 (triiodothyronine) and T4 (thyroxine) that regulate BMR of a person. It is found that hypothyroidism (low secretion of thyroid hormones) and hyperthyroidism (excessive secretion of thyroid hormones) lead to significant decrease and increase in BMR, respectively. Hence, it is the correct answer.

Justify reasons for the incorrect answers:

Option (a) is given as ‘the greater the person’s age, greater the BMR’. BMR is affected by muscle mass...

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