Explain negative feedback control using thyroid hormones as an example
What will be an ideal response?
Thyroid hormones (T3 & T4) are produced by the thyroid gland. Levels are maintained within a
physiological range. When theT3 and T4 levels drop due to metabolism, the hypothalamus produces
thyroid releasing hormone (TRH), which acts on the anterior pituitary to produce thyroid stimulating
hormone (TSH). TSH stimulates the thyroid to produce and release T3 and T4. As the levels of T3 and
T4 increase, the hypothalamus decreases the production of TRH and thus TSH from the anterior
pituitary also decreases.
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Which of the following white blood cells targets worms and fungi?
a. neutrophils b. basophils c. eosinophils d. dendritic cells e. B and T lymphocytes
The cellular binding of IgE during an allergic reaction causes the release of which chemicals?
a. heparin and bradykinin b. prostaglandins and histamine c. histamine and serotonin d. prostaglandins and bradykinin e. serotonin and prostaglandins
The oversecretion of ________ by the thyroid gland can result in ________.
A. T3; hyperthyroidism B. parathyroid hormone; Graves disease C. T3; hypothyroidism D. calcitonin; hyperthyroidism E. T4; hypothyroidism
What occurs during viral uncoating?
a. The capsid breaks apart, releasing the viral genome. b. The nucleic acid breaks apart, allowing for translation. c. The viral envelope is released. d. The viral proteins are synthesized.