Word Count : 462

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In insects, moulting and metamorphosis are controlled primarily by three major hormones: ecdysone (also called moulting hormone), juvenile hormone (JH), and prothoracicotropic hormone (PTTH). These hormones work in a coordinated manner to regulate the processes of moulting and the transformation of the insect from one developmental stage to another. Prothoracicotropic hormone (PTTH) is secreted by neurosecretory cells in the insect brain and plays a key role in initiating moulting. PTTH stimulates the prothoracic glands to secrete ecdysone. ___ ____ ______ _________ ________ ____ _________.
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