Secretion of thyroxine (thyroid hormone by the thyroid gland is controlled by ne

Question

Secretion of thyroxine (thyroid hormone by the thyroid gland is controlled by negative feedback. Choose one answer below that best describes this process. a) control of thyroxine secretion through negative feedback helps to maintain homeostasis b) high levels of thyroxine in the blood inhibit production of TRH by the hypothalamus and TSH by the pituitary gland c) when thyroxine levels in the blood are low, the hypothalamus secretes more TRH, the pituitary gland secretes more TSH, and as a result, the thyroid gland produces more thyroxine d) (a), (b), and (c) are all true e) only (a) and (b) are true When there is too little iodine in the diet, the body can't make active thyroid hormone. Choose one answer below that best describes what happens in this situation. a) the hypothalamus produces TRH continuously b) the pituitary gland produces TSH continuously c) the thyroid gland grows to form a goiter d) (a), (b) and (c) e) (b) and (c) The thyroid gland and the parathyroid gland work together to maintain blood calcium levels at 10mg/100ml. Choose the one answer below that best describes how this process works: a) the thyroid gland produces calcitonin which lowers blood calcium levels b) the parathyroid glands produce parathyroid hormone (PTH) which raises blood calcium levels c) calcitonin reduces reabsorption of calcium in the kidneys and stimulates calcium deposition in bones d) PTH increases reabsorption of calcium in the kidney and stimulates calcium release from bones e) (a) - (d) are all correct Two hormones produced by the pancreas work together to maintain blood glucose levels at about 90mg/100ml. Identify the following

Explanation / Answer

75) the answer is e. In negative feedback increase level of thyroxine will inhibit the secretion of TSh and TRH from hypothalamus and pitutary.

76) the answer is d

77) the answer is e

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