Chromaffin cell. Chromaffin cells, also pheochromocytes, are neuroendocrine cells found mostly in the medulla of the adrenal glands (located above the kidneys) in mammals.
The elements sodium (Na) and potassium (K) have been detected in the Moon's atmosphere using Earth-based spectroscopic methods, whereas the isotopes radon -222 and polonium -210 have been inferred from data obtained by the Lunar Prospector alpha particle spectrometer.
The Moon orbits around the Earth in an elliptical path, with one side of the orbit closer to Earth than the other. The side of the orbit closer to the Earth is called the lunar perigee, while the side futher from the Earth is called the lunar apogee.