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Introduction:
The thyroid gland consists of two lobes, and it is the largest (25 g) adult endocrine gland. The isthmus connects the two lobes of the thyroid gland. It is located at the neck, adjacent to the trachea and beneath the larynx. It appears like a butterfly shape and covered around the trachea. It is composed of thyroid follicles that are covered by follicular cells. The follicular cells secrete thyroid hormones (TH) such as triiodothyronine (T3) and thyroxine (T4). The thyroid gland releases TH into the blood stream. Thyroid hormones act by binding to their thyroid hormone receptors (TR), which is a superfamily of nuclear receptors. TR-encoding genes are classified into α (TRα) and β (TRβ). Thyroid-stimulating hormone (TSH) regulates hormones (T3 and T4) secretion from the thyroid. TH raises the
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Chapter 17 Solutions
EBK ANATOMY & PHYSIOLOGY: THE UNITY OF
- In 2-3 paragraphs (must be typed) explain: Discuss the regulation of cholesterol synthesis.arrow_forwardTrue O False Neuraminic acid is a monosaccharide found in human. True False Glucose cannot diffuse directly into cells.arrow_forwardIn healthy adults, the concentration of glucose in blood is approximately80 to 110 milligrams per deciliter (mg/dl). After a carbohydrate-richmeal, however, the concentration may spike to 140 mg/dl. Describe thehormonal action that returns blood glucose to normal.arrow_forward
- Proteins are compounds composed of many _________ linked together ketones aldoses amino acids ketoacidsarrow_forwardDo you agree or disagree with the following statements? Explain your answer. Neutralizing the negative charge on the carbohydrate portions of a proteoglycan should cause the ECM that houses the proteoglycan to become more liquefied.arrow_forwardThe carrier of molecules of carbon dioxide in fatty acid synthesis is _____________.arrow_forward
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