http://www.anatomyzone.com. 3D anatomy tutorial providing a basic introduction to respiratory anatomy using the Zygote Body Browser (http://www.zygotebody.com). This is the second part of the tutorial and covers the bronchial tree and lungs.Join the Facebook page for updates: http://www.facebook.com/anatomyzone.his is the second part of the tutorial and covers the bronchial tree and lungs. Join the Facebook page for updates: http://www.facebook.com/anatomyzone.
The average atomic mass of carbon is 12.011. This is a weighted average based on three forms (isotopes) of carbon with different natural abundances. Carbon 12 has an atomic mass of 12.00 (carbon 12 is a special case because its mass is <i>defined</i> to be exactly 12 atomic mass units) and a natural abundance of 0.9893.
Carbon 13 has an atomic mass of 13.00335 and a natural abundance of 0.0107 (about 1.1%). Carbon 14 has an atomic mass of 14.003 and an abundance of 0.000000000001 (1 part in a trillion). Because it is so rare, carbon 14 makes an infinitesimal contribution to the average atomic mass.