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Exercise 4: Endocrine System Physiology: Activity 1: Metabolism and Thyroid Hormone Lab Report Pre-lab Quiz Results You scored 33% by answering 2 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 Your answer : b. secreted by the thyrotropin gland, located in the neck.. Correct answer: c. the most important hormone for maintaining the metabolic rate and body temperature. 3. Thyroid-stimulating hormone (TSH) is Your answer : c. secreted by the posterior pituitary. Correct answer: 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 Your answer : c. held at a low plasma concentration by low levels of TSH. Correct answer: a. secreted by the hypothalamus. 6. Which of the following statements is true? Your answer : a. TRH travels from the hypothalamus to the thyroid gland via the hypothalamic-thyroid portal system. Correct answer: b. The hypothalamus primarily secretes tropic hormones that stimulate the secretion of other hormones.

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Experiment Results Predict Question: Predict Question 1: Make a prediction about the basal metabolic rate (BMR) of the remaining rats compared with the BMR of the normal rat you just measured. Your answer : c. The BMR of both remaining rats will be lower than the normal rat's BMR. Predict Question 2: What do you think will happen after you inject thyroxine into the three rats? Your answer : a. The normal rat will become hyperthyroidic and develop a goiter. Predict Question 3: What do you think will happen after you inject TSH into the three rats? Your answer : a. The normal rat will become hyperthyroidic and develop a goiter. Predict Question 4: Propylthiouracil (PTU) is a drug that inhibits