Final answer:
Atoms are made up of three types of subatomic particles: the proton, neutron, and electron. These particles are important for understanding chemical reactions in the human body because they determine the element, mass, and charge of an atom.
Step-by-step explanation:
Atoms are made up of three types of subatomic particles: the proton, neutron, and electron. The proton carries a positive charge and is found in the nucleus, while the neutron has no charge and is also found in the nucleus. The electron carries a negative charge and orbits around the nucleus. These particles are important for understanding chemical reactions in the human body because they determine the element, mass, and charge of an atom.