phylum. 1  Biology. the primary subdivision of a taxonomic kingdom, grouping together all classes of organisms that have the same body plan. 2  Linguistics. a category consisting of language stocks that, because of cognates in vocabulary, are considered likely to be related by common origin. Compare stock (def 13).
There are between 500 and 600 lymph nodes in the average adult human body.
The human brain is one of the most complex organs in your body. It has 50-100 nerve cells that are constantly interacting with each other. The protein tau normally stabalizes the microtubules.