Brenda's blood test that reveals high levels of thyroid-stimulating hormone (TSH) but low levels of triiodothyronine, or T3, and thyroxine, or T4. Determine if these results are normal or if they reveal a homeostatic imbalance. Explain to support your
answer.
What will be an ideal response?
These blood test results are not normal; these results are consistent with a homeostatic imbalance known as hypothyroidism. With hypothyroidism, the thyroid gland is unable to produce enough T3 and T4. In response, the hypothalamus and pituitary gland continue to prod the thyroid gland through increased secretion of thyrotropin-releasing hormone (TRH) and thyroid-stimulating hormone (TSH) in an attempt to stimulate the thyroid gland. This leads to the characteristic elevated TSH and decreased T3 and T4 levels seen with hypothyroidism.
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Indicate whether the statement is true or false
Which of the following characteristics is not associated with platelets?
a) They contain granules with clotting factors and enzymes. b) They are incapable of oxidative catabolism. c) They are cell fragments. d) They do not have a nucleus.
Somatostatin functions in glucose homeostasis by
a. promoting reduced growth of the body, decreasing the need of individual cells for glucose, and thereby promoting glucose sparing. b. inhibiting digestion and absorption of nutrients, preventing hyperglycemia. c. inhibiting secretion of prolactin, reducing production of lactose for milk, and preventing hypoglycemia. d. doing all of these. e. doing none of these.
Where are unmyelinated nerve fibers surrounded by Schwann cells?
A. In the CNS B. In the PNS and CNS C. In the PNS D. Nowhere. Unmyelinated nerve fibers are never surrounded by Schwann cells.