<prompt> Major part of semen is secreted by-Seminal vesicleCowpers glandsProstateUrethral gland  <response>: Ans. is a i.e., Seminal vesicl Seminal vesicle secretions contributes 60 of total volume of semen.Composition of human semenPhysical characterSeminal Vesicle secretions contributes 60 oftotal volumeFrom prostate 20 of volumeBuffers Colour : white, opalescent Specific gravity : 1.028 Ph: 7.35 -7.50 Sperm-count: 100 millionmL with fewer than 20 abnormal form Contain hyaluronidase Fructose 1.5-6.5 mgml Flavins Ergothionene Ascorbic acid Phosphoryl choline Prostaglandins Spermine Citric acid Cholesterol Phospholipids Fibrinolysin Zinc Acid phosphatase Phosphate Bicarbonate 