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2 years ago
Exercise 4: Endocrine System Physiology: Activity 1: Metabolism and Thyroid Hormone Lab Report
Pre-lab Quiz Results
You scored 100% by answering 6 out of 6 questions correctly.
1. Which of the following statements about metabolism is false?
You correctly answered: d. All of the energy from metabolism is ultimately stored in the chemical bonds of ATP.
2. Thyroxine is
You correctly answered: c. the most important hormone for maintaining the metabolic rate and body temperature.
3. Thyroid-stimulating hormone (TSH) is
You correctly answered: b. produced in the pituitary gland.
4. An injection of TSH to an otherwise normal animal will cause which of the following?
You correctly answered: d. goiter development
5. Thyrotropin-releasing hormone (TRH) is
You correctly answered: a. secreted by the hypothalamus.
6. Which of the following statements is true?
You correctly answered: b. The hypothalamus primarily secretes tropic hormones that stimulate the secretion of other
hormones.

Post-lab Quiz Results
You scored 85% by answering 6 out of 7 questions correctly.
1. How would you treat a thyroidectomized animal so that it functions like a "normal" animal?
You correctly answered: c. Provide the animal T4 supplements.
2. As a result of the missing hormone(s) in the hypophysectimized rat, what would be some expected symptoms?
You correctly answered: d. decreased basal metabolic rate
3. An injection of thyroxine to an otherwise normal rat will cause which of the following?
You correctly answered: b. hyperthyroidism
4. Why didn't any of the rats develop a goiter after thyroxine injection?
You correctly answered: a. In all cases, TSH levels were not elevated by the thyroxine injection.
5. Why did the normal rat develop a palpable goiter with the TSH injection?
Your answer: a. The TSH receptors in the hypothalamus were overstimulated.
Correct answer: c. The TSH receptors on the thyroid gland were excessively stimulated.
6. An injection of propylthiouracil to an otherwise normal animal will cause which of the following?
You correctly answered: b. goiter development
7. Why did the normal rat develop a palpable goiter with the propylthiouracil injection?
You correctly answered: d. The injection decreased the negative feedback mechanism on TSH.
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