throat
嚨 centers on the throat as a passage for sound and breath. Its meaning is straightforward and anatomical.
嚨 combines 口 (mouth) with 龍, which likely contributes the sound. The character is a phono-semantic compound where 口 indicates the meaning related to the throat or mouth.
The mouth 口 beside the dragon 龍 suggests a dragon's roar coming from deep in the throat. Picture the throat as the passage where the dragon's voice emerges.
For ロウ, imagine a low, rumbling roar from the dragon's throat: low -> ロウ, and the sound vibrates through the throat.