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aime_nathan_SCI132_Week5-Exercise4

aime_nathan_SCI132_Week5-Exercise4 - Exercise 4 Endocrine...

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Exercise 4: Endocrine System Physiology Worksheet Assignment Due: Week 5 Student instructions : Follow the step-by-step instructions for this exercise found in your text and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus. Please make sure that your answers are typed in RED . Please type your Name and Student ID Number here: Nathan Aime 4134653 Hormones and Metabolism Activity 1: Determining the Baseline Metabolic Rates 1. Which rat had the fastest baseline metabolic rate? The Normal rat. 2. Why did the metabolic rates differ? Thyroxine cannot be produced in the thyroidectomized rat or the hypophysectomized rat, therefore, reducing the metabolic rate. 3. If an animal has been thyroidectomized, what hormone(s) would be missing from its blood? Thyroxine 4. As a result of the missing hormone(s), what would the overall effect on the body and metabolism be? A slower metabolic rate. 5. How could you treat a thyroidectomized animal so that it functioned like a “normal” animal? Inject it with thyroxine. 6. If an animal has been hypophysectomized, what effect would you expect to see in the hormone levels in its body? There will be an increase in TRH, but a decrease in Thyroxine. 7. What would be the effect of a hypophysectomy on the metabolism of an animal? The metabolism would decrease. Activity 2: Determining the Effect of Thyroxine on Metabolic Rate 1. What was the effect of thyroxine on the normal rat’s metabolic rate? How does it compare to the normal rat’s baseline metabolic rate? Thyroxine increased the metabolic rate. Metabolic rate increased from 1706 to 1924 ml O2/kg/hr.
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