消化管

• 氵(water; liquid)RADICAL
• 肖(resembling; diminishing)PHONO-SEMANTIC

Water gradually drips away and disappears, that is the meaning of the character tiêu.

• 亻(person; human)RADICAL
• 匕(spoon; compare)PHONETIC

A person standing upright beside a person bending down shows how shapes transform and change.

• ⺮(bamboo)RADICAL
• 官(official; manage)PHONO-SEMANTIC

A bamboo tube is managed by officials, so 管 means both tube and to manage.