A noncovalent bond between an electronegative atom (commonly oxygen or nitrogen) and a hydrogen atom covalently bonded to another electronegative atom. Particularly important in stabilizing the three-dimensional structure of proteins and formation of base pair s in nucleic acids.
Introduction[edit] The respiratory system serves three principal purposes in the human body: gaseous exchange; sound production; and assistance in compression of the abdomen. It can be divided into two structural divisions, upper and lower, as well as two functional divisions, conducting and respiratory.
The lungs, trachea, bronchi, bronchial tubes, ribs, diaphrahm, nasal cavity, esophagus, pharnx, aveoli, nose and the mouth. The windpipe and the bronchial tubes are parts of the respiratory system. The air enters and exits through the nose and mouth.he primary function of the respiratory system is to supply the  blood with oxygen in order for the blood to deliver oxygen to all  parts of the body. The respiratory system â¦ does this through  breathing.