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Chemical Coordination and Integration
Question
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Physiologically active thyroxine exists in which of the following form ?

  • Unbound

  • Bound to albumin

  • Bound to globulin

  • All of the above

Answer

A.

Unbound

Once the thyroxine is in the circulation, it binds to albumin. Only the free unbound form of thyroxine is physiologically active.

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