Channel Protein.
Ureter. The urethra connects the bladder to the outside world.
They use their long, tubelike tongues like straws to suck the nectar out of the flowers and they store it in their "honey stomachs". Bees actually have two stomachs, their honey stomach which they use like a nectar backpack and their regular stomach. The honey stomach holds almost 70 mg of nectar and when full, it weighs almost as much as the bee does. Honeybees must visit between 100 and 1500 flowers in order to fill their honey stomachs.The honeybees return to the hive and pass the nectar onto other worker bees. These bees suck the nectar from the honeybee's stomach through their mouths. These "house bees" "chew" the nectar for about half an hour. During this time, enzymes are breaking the complex sugars in the nectar into simple sugars so that it is both more digestible for the bees and less likely to be attacked by bacteria while it is stored within the hive. The bees then spread the nectar throughout the honeycombs where water evaporates from it, making it a thicker syrup. The bees make the nectar dry even faster by fanning it with their wings. Once the honey is gooey enough, the bees seal off the cell of the honeycomb with a plug of wax. The honey is stored until it is eaten. In one year, a colony of bees eats between 120 and 200 pounds of honey.
The vascular tissue in plants, specifically xylem and phloem, contain bundles of tubelike cells that carry water and food throughout the plant. Xylem transports water and nutrients from the roots to the rest of the plant, while phloem carries sugars produced during photosynthesis to other parts of the plant.
A follicle is the tubelike structure from which hair grows.
tubular
tubelike streucture
Smooth Muscles line the walls of tubelike structure such as the gastrointestinal tract, the urinary system, the blood vessels and the bronchi of the lungs.
Hair Follicle
Esophagus
proboscis
vascular plants
The tubelike structure that contains the root of the hair is called the hair follicle. The hair follicle is located in the dermis of the skin and plays a vital role in hair growth and regeneration.
Mosquitoes , aphids and butterflies are examples of tubular mouth parts.
I think you might be thinking of the esophagus.