Xylem and Phloem
Tiny tube-like veins called phloem transport material inside a plant. For example, water from the roots travels up these tubes to reach the leaves, and the energy from photosynthesis travels down the tubes to reach the roots.
They're called "nanotubes".
Xylem and phloem
ducts
A tiny Particle is Called an Atom.
Alveoli
The alveoli.
Alveoli
endoplasmic reticulum
Tubes in the kidney. I'm not sure what they are called, though.
Tiny tube-like veins called phloem transport material inside a plant. For example, water from the roots travels up these tubes to reach the leaves, and the energy from photosynthesis travels down the tubes to reach the roots.
Capillaries are the tiny tubes that carry blood. These tubes connect arteries and veins.
Capillaries are the tiniest of the blood vessels. They connect arteries and veins.
They're called "nanotubes".
Bronchioles.
alveoli
would not have a clue