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Title: help Post by: BIOLOGY FREAK on Sep 26, 2010 The thyroid gland can concentrate the iodide ion to about 25 times its normal concentration in blood. This is a result of
a. diffusion b. passive transport c. exocytosis d. active transport Title: Re: help Post by: bio_man on Sep 26, 2010 The active uptake of iodide (I-) by the follicular cells involves an energy-requiring (ATPase-dependent) transport mechanism which allows I- to be taken up from capillary blood against both a concentration and an electrical gradient in exchange for Na+. This enables the thyroid gland to concentrate iodide 30–50 times that of the circulating concentration and allows radioactive isotopes to be used to investigate patients with thyroid disease.
d. active transport Title: Re: help Post by: BIOLOGY FREAK on Sep 26, 2010 wow thanks!
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