your ear is your smallest part on your body and your sternam (breast bone).
the human cell
The smallest parts of the human body are contained in the cells.
The smallest bone in the human body, they are a part of your ears.
The smallest part of the human body is considered to be the cell, which is the basic structural and functional unit of all living organisms. Cells are microscopic in size and perform a variety of important functions to keep the body functioning properly.
The malleus, the incus, and the stapes are the three smallest bones in the human body and they are all in the ear.
The smallest enzyme present in the human body is probably Triosephosphate isomerase.
Bacteria
The cell, is the smallest part of the body that is said to be alive.
In the ear.
The smallest blood vessels in the body are called capillaries.
maybe the cell
That question should probably be more limited, something like, what is the smallest bone in the human body (one of the inner ear bones), or what is the smallest organ (possibly the pineal gland) rather than what is the smallest part, because everything in the universe is ultimately made of the same small parts, which are sub-atomic particles. From the perspective of a physicist, a quark would be the smallest part.