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| | Prostate Gland |
 | | The prostate gland produces a secretion known as prostate fluid that makes up most of the liquid part of semen, which is discharged from the penis during sexual orgasm. |
 | | In BPH, the prostate gland can increase in size from 20 g (0.71 oz), which is the average size of the prostate in younger men, to as large as 150 g (5.31 oz). |
 | | In bacterial prostatitis, which may be sexually transmitted, a bacterial infection in the prostate gland leads to infection, swelling, pain, and difficulty in urinating; the penis may release bacterial fluid, and blood may appear in the urine. |
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