There is a big difference. A polysomnograph is only capable of measuring the electrical activity associated with eye movement, in particular during sleep. An EEG measures the electrical current that are passing in your brain and is not limited to sleep medicine but neurology and diagnostic medicine. You'd use a poly. During sleep studies.
Protons, Neutrons, and Electrons. I'm only in middle school, but my teacher said that's all that's in atoms.
3. golgi apparatus
2. rough endoplasmic
1. cytoplasm
i tried my best
