like from the cell like is it a nucleus or a nucleolus or what is it
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Neither the nucleus or nucleolus are anymore fundamental parts of the cell than any other of the organelles. You cannot make an endoplasmic reticulum or a mitochondrion out of exclusively cell nuclei or cell nucleoli.
The most fundamental building block of the human body (and for all other macroscopic lifeforms' bodies) is the cell itself. Any smaller than that, and it no longer qualifies as life.
That isn't to say that smaller than the single cell, there aren't other building blocks. Of course there are...they just don't function on their own as life. The cell has individual organelles. Do a search on organelles to learn about all the organelle types that there are.
Everything eventually is comprised of molecules. Now we are at the smallest building block of any pure substance (compound) that you can still call that substance.
Molecules are comprised of atoms. Atoms are the smallest building block of a special set of substances that are called elements.
Smaller than the atom, and we call them subatomic particles. Protons, neutrons, and electrons comprise the atoms of which you are most familiar. These particles each have their own set of even weirder cousins, which simply aren't found in the matter you ordinarily encounter, but have certainly been discovered.
The most fundamental building block of the human body (and for all other macroscopic lifeforms' bodies) is the cell itself. Any smaller than that, and it no longer qualifies as life.
That isn't to say that smaller than the single cell, there aren't other building blocks. Of course there are...they just don't function on their own as life. The cell has individual organelles. Do a search on organelles to learn about all the organelle types that there are.
Everything eventually is comprised of molecules. Now we are at the smallest building block of any pure substance (compound) that you can still call that substance.
Molecules are comprised of atoms. Atoms are the smallest building block of a special set of substances that are called elements.
Smaller than the atom, and we call them subatomic particles. Protons, neutrons, and electrons comprise the atoms of which you are most familiar. These particles each have their own set of even weirder cousins, which simply aren't found in the matter you ordinarily encounter, but have certainly been discovered.