No, a cell is the smallest part of a living organism that can be considered alive.
When you consider the composition of living and non living things, both can be broken down into what comprises them. If one considers non-living matter, then "particle" may be used to describe the smallest unit. As knowledge advances, a "particle" by definition has evolved i.e., quarks being the smallest "particle" of an atom whereas for years it was thought that the atom was the smallest unit of matter. Conversely, the cell is considered the smallest unit of organic (living) matter The only major difference between them is that a cell is the smallest particle of a living object and a molecule (made up of atoms) is the smallest unit of a nonliving object.
Cell
A cell.
When we "look" at the smallest things known, we must consider the group of subatomic particles. The tiniest units of matter exist in this quantum mechanical world. As we're still sorting out some things here, it may be hard to be more specific. But let's nominate the electron neutrino, a fundamental particle, as the least massive of the particles in that group.
Cell
the basic structural unit of living matter is THE ATOM
the process by which a cell uses energy to surround a particle and enclose the particle in a vesicle to bring the particle into the cell is called endocytosis: the cell comes into contact with particle the cell membrane begins to wrap around the particle then the particle is bought into the cell
phagocytosis
The smallest piece of a chemical compound is a molecule. The smallest part of an element is an atom. The smallest part of an atom (meaning of the proton, neutron and electron, which are an atom's building blocks) is the electron. Beyond that, the quark is a fundamental building block of matter, and it makes up neutrons and protons. Quarks also explain the "particle zoo" seen before the Standard Model arose to gather the phenomenon under one theoretical umbrella.
The smallest cells in the human body are the Granule/Golgi neurons in the granular layer (innermost layer of grey matter) of Cerebellum.
This question is vague therefore I have provided two answers and explanations. The single cell is the smallest living unit within a living system. Quarks are the smallest particles of matter and atoms which composes all living things.
the smallest egg cell is fish egg cell