Question

How does the BMR, in the case of the thyroidectomized rat after PTU injections, compare with the normal rat's BMR? Why was this effect observed?

A. Higher BMR; presence of thyroid hormones.
B. Lower BMR; absence of thyroid hormones.
C. Unchanged BMR; PTU inhibits hormone production.
D. Fluctuating BMR; unpredictable response to PTU.

Answer 1

The correct option is C. The BMR of a thyroidectomized rat after PTU injections is lower compared to a normal rat's BMR. This is due to the absence of thyroid hormones, which play a key role in regulating BMR.

Step-by-step explanation:

In the case of a thyroidectomized rat after PTU injections, the BMR is expected to be lower compared to a normal rat's BMR. This is because PTU inhibits hormone production, including the production of thyroid hormones.

Thyroid hormones play a key role in regulating BMR, so their absence leads to a lower metabolic rate. The BMR of a thyroidectomized rat after PTU injections is lower compared to a normal rat's BMR. This is due to the absence of thyroid hormones, which play a key role in regulating BMR.