Lab 4: Endocrine System Physiology
1.  Refer to Activity 1: Determining Baseline Metabolic Rates. How did the baseline metabolic rates of the three rats differ? Answer: The metabolic rates for the thyroidectomized and hypophysectomized rats were lower than that of the normal rat. 


2.  Why did the metabolic rates differ? Check all that apply: Answers: The hypophysectomized rat lacked thyroidstimulating hormone.
The thyroidectomized rat lacked thyroxine hormone.  


3.  Refer to Activity 2: Determining the Effect of Thyroxine on Metabolic Rate. How did the thyroxine affect the normal rat's metabolic rate? Answer: It caused the rate to increase. 


4.  What was the effect of thyroxine on the thyroidectomized rat's metabolic rate? Answer: Thyroxine increased the metabolic rate. 


5.  What was the effect of thyroxine on the hypophysectomized rat? Answer: Thyroxine increased the metabolic rate.  


6.  Refer to Activity 3: Determining the Effect of TSH on Metabolic Rate. What is the effect of TSH on the normal rat's metabolic rate? Answer: TSH increased the metabolic rate.  


7.  How did the metabolic rate of the thyroidectomized rat injected with TSH compare to its baseline metabolic rate? Answer: It was the same as the baseline rate. 


8.  What was the oxygen consumption per hour for the hypophysectomized rat injected with TSH? Answer: 1738.8 ml/O2/kg/hr  


9.  Refer to Activity 4: Determining the Effect of Propylthiouracil on Metabolic Rate. What effect did an injection of propylthiouracil have on the metabolic rate of the normal rat? Answer: The metabolic rate decreased from 1704 ml/O2/kg/hr to 1536 ml/O2/kg/hr.  


10.  What was the effect of the propylthiouracil on the thyroidectomized rat? Answer: There was no effect.  


11.  Refer to Activity 5: Hormone...
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