A. Increase the basal rate of oxygen consumption and heat production
B. Increase cardiac output
C. Increase gluconeogenesis and glycogen degradation
D. Stimulate cartilage growth
E. Stimulate endochondral ossification and linear growth of bone
F. Play a crucial role in central nervous system (CNS) development (a deficiency of T, and T4 results in permanent brain damage)
Na+I" cotransporter jJH2 CH2CHCOOH
Figure 21-1. Diagram of triiodothyronine (T}) and thyroxine (T4) synthesis and secretion by follicular cells. The secretion of calcitonin by parafollicular cells also is shown. DIT = diiodotyrosine; MIT = inonoiodotyro-sine; TBG = thyroid-binding globulin; TG = thyroglobulin; TSI I = thyroid-stimulating hormone.
IV. PARAFOLLICULAR CELLS secrete calcitonin, which acts directly on osteoclasts to decrease bone resorption, thereby lowering blood calcium levels.
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