Abstract
Normal human seminal plasma (9) was analyzed for Zn by employing the method of instrumental neutron activation analysis. The range of concentration of Zn was from 2.5-25.7 mg%. The Zn in seminal plasma may function in 2 ways: it has an essential role inside the spermatozoa for motility and it provides a favorable medium for the activity of the spermatozoa. The 2nd function can be replaced by other ions.