BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 31, Problem 2CT
Cells of an overactive thyroid can be killed by radioactive iodine. Explain why the thyroid’s hormone-producing cells take up more radioactive iodine than other cells of the body.
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Thyroid hormones are produced mainly is T4 , while the physiologically active form is T3 . Explain ?
Thyroid hormones are important in regulating the body’s basal metabolic rate. Thyroid hormones are lipid-soluble and have a long half-life.What are the advantages and disadvantages of a long half-life for thyroidhormones, compared with a short half-life?
How are thyroid hormones transportes in the bloodstream ? Why ? Do the hormones enter the target cell directly ? Describe briefly the sequence of events when thyroid hormones bind to their receptors.
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BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Addisons disease develops when the adrenal cortex does not secrete enough mineralocorticoids and glucocorticoids. President John F. Kennedy was diagnosed with the disease when he was a young man. Before he started treatment with hormone replacement therapy, he was hypoglycemic and lost weight. Which missing hormone was responsible for his weight loss? How might Addisons disease have affected his blood pressure?arrow_forwardA physician sees a patient whose symptoms include sluggishness, depression, and intolerance to cold. After eliminating other possible causes, the doctor diagnoses a hormone problem. What disorder fits the symptoms? Why does the doctor suspect that the underlying cause is a malfunction of the anterior pituitary gland?arrow_forwardFigure 37.14 Hyperthyroidism is a condition in which the thyroid gland is overactive. Hypothyroidism is a condition in which the thyroid gland is underactive. Which of the conditions are the following two patients most likely to have? Patient A has symptoms including weight gain, cold sensitivity, low heart rate, and fatigue. Patient B has symptoms including weight loss, profuse sweating, increased heart rate, and difficulty sleeping.arrow_forward
- Give two examples of feedback control of hormone activity.arrow_forwardWhich hormones produced in the posterior and anterior lobes of the pituitary gland have the targets indicated? Below, fill in the blanks using the abbreviations noted in Section 15.3.arrow_forwardFigure 16.14 Goiter, a disease caused by iodine deficiency, results in the inability of the thyroid gland to form T3 and T4 . The body typically attempts to compensate by producing greater amounts of TSH. Which of the following symptoms would you expect goiter to cause? a. Hypothyroidism, resulting in weight gain, cold sensitivity, and reduced mental activity. b. Hyperthyroidism, resulting in weight loss, profuse sweating and increased heart rate. C. Hyperthyroidism, resulting in weight gain, cold sensitivity, and reduced mental activity. d. Hypothyroidism, resulting in weight loss, profuse sweating and increased heart rate.arrow_forward
- Briefly describe how thyroid hormones is made in the thyroid gland. What are the necessary components?arrow_forwardTake thyroid hormones as an example of hormones and their properties. Thyroid hormone is highly bound to proteins in the blood. What is the benefit of such protein binding? What effect does protein binding have on the activity of the hormone? Name a gland other than the thyroid gland that is involved in regulating thyroid hormone production?arrow_forwardAnother general principle of physiology is that structure is a determinant of—and has coevolved with—function. The structure of the thyroid gland is very unlike other endocrine glands. How is the structure of this gland related to its function?arrow_forward
- Most laboratories are able to determine blood levels of TSH, T3,and T4. Given that ability, design a method of determining whetherhyperthyroidism in a patient results from a pituitary abnormality or from the production of a nonpituitary thyroid stimulatorysubstance.arrow_forwardUnlike the glucocorticoid receptor, the thyroid receptor has an activity even in the absence of thyroid hormone. Explain the activity of the receptor under these conditions and how hormone binding changes the activity.arrow_forwardPatients with acromegaly have increased circulating levels of GH and exhibit abnormal glucose tolerance due to severe insulin resistance. Explain why growth hormone is diabetogenic.arrow_forward
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