semen components. test tube with sperm cells

acid amino analysis artificial biological biology biotechnology bulbourethral cell chart clinic closeup component components container diagram donor ejaculate elements evolution fertility fertilization fructose gland health hormone human illustration infertility infographic insemination ivf lab laboratory lubricat macro male medical medicine micro microbiology percentage pregnancy prostate protein reproduction research science secretion semen seminal sex sexual sperm spermatozoa spermatozoon structure test testes tube urethral vector vesicles