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BIOLOGY FREAK

wrote...

13 years ago

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

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bio_man

wrote...

Educator

13 years ago

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

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BIOLOGY F. Author

wrote...

13 years ago

wow thanks!

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