fresh spermatozoa in urine sediment

anatomy biology cell cells concept count development diploid dna female fertile fertility fertilization fertilize gametes genetic health human infertility insemination isolated life male medical medicine men menstruation microscopic ovulation ovule pregnancy procreation reproduction reproductive science semen seminiferous sex sperm spermatid spermatogenesis spermatogonia spermatogonium spermatozoa swim treatment zygote