HBS 2 PDF

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HBS 2.3.2...

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2.3.2

Lincoln is a 27 year-old man who has been experiencing strange medical symptoms over the past year. He knows something is wrong, but doctors are having a hard time piecing together the clues. Previous doctors’ notes report: ●

Has noted a gradual enlargement of his body tissue. He is long past puberty, but the bones of his face and jaw seem to be growing thicker and changing shape. Even his hands and feet look larger. Pituitary gland problems may be affecting HGH production, the lack of HGH regulation could cause Lincoln’s tissue enlargement.

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Lincoln has put on a considerable amount of weight in the past year. His diet has not changed and he still plays basketball two times a week with his friends. [Hypothalamus/T4]

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He’s getting plenty of rest, but he still feels sluggish.

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Lincoln and his wife have been trying to get pregnant for over a year. Worried about their chances, they decide to visit the doctor. Routine lab tests reveal that Lincoln has an extremely low sperm count. [Testes/Pituitary]

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Most recently, Lincoln has reported some problems with his vision. He has noticed that images are blurry and that he sometimes sees double. Doctors are baffled by what Lincoln is reporting. His varied symptoms make the overall cause of his problems hard to pinpoint, but doctors are sure the answer lies in the endocrine system. [Optic Nerve]

Hormones/Glands Involved ● Pituitary Gland ● Optic Nerve - Possibly affected by tumor in pituitary ● HGH ● T4

2.3.2

Conclusion Questions 1. Describe an example that illustrates this statement: “Some hormones control the release of other hormones.” An example of the fact that some hormones control the release of other hormones is the hypothalamus and pituitary and thyroid chain. The hypothalamus signals the pituitary to release thyroid-stimulating hormone, which causes the thyroid to release thyroxin. 2. The pituitary gland is often called the “control center of the endocrine system.” Why do you think this is an appropriate title? Because it is from this gland that most of the body's hormones are released that cause other glands in the endocrine system to release hormones. 3. Explain how Lincoln’s endocrine system disorder affected other body systems. His tumor also seems to be causing a decrease in the release of LH to the gonads, which is causing a decrease in testosterone, resulting in low sperm count. This is affecting his reproductive system. The excess HGH is affecting his skeletal system. 4. Explain the role the hypothalamus plays in regulating hormone action. The hypothalamus is crucial in regulating hormone action. Everything begins with the hypothalamus, because the hypothalamus controls the pituitary, which controls most other glands in the endocrine system....