active and passive
The two major classes are homogeneous and heterogeneous mixtures.
Tactile receptors, baroreceptors, and proprioceptors
You will need to take many math classes in your first two years. In your final two years you will start to take classes that are geared more toward your major.
Nobles and czars.
the major classes of materials
It really depends on the major for some of the classes. All undergraduate students have to take certain general education classes. The last two years, roughly, are classes related specifically to the major the student has chosen. www.harvard.edu/academics
Taste Buds ;)
Two or more major, required classes for more than two quarters (1 quarter is 10 weeks)
nicotinic acetylcholine receptors (nAChR, also known as "ionotropic" acetylcholine receptors) are particularly responsive to nicotinemuscarinic acetylcholine receptors (mAChR, also known as "metabotropic" acetylcholine receptors) are particularly responsive to muscarine.Nicotinic and muscarinic are two main kinds of "cholinergic" receptors.
In the 19th century there were aristocracy and serfs.
Emperor, Nobility and Priests were the major classes of Aztec society.
Lymphomas can be divided into two main types: Hodgkin's lymphoma or Hodgkin's disease, and non-Hodgkin's lymphomas.