what is the normal size of human testis
Testicle A length of a testicle can be measured with an orchidometer. Its volume is 15 to 25 ml.Template:Needs reference There is some evidence to suggest that average human testicle size and weight has been progressively diminishing in recent years among younger cohorts in Western industrialized nations. This may be associated with a decline in sperm counts. The recent changes suggest involvement of environmental or lifestyle factor(s) such as increasing exposure to endocrine disruptors.[1]
Spermatogenesis For humans, the entire process of spermatogenesis is variously estimated as taking 74 days[5][6] (according to tritium-labelled biopsies) and approximately 120 days[7] (according to DNA clock measurements). Including the transport on ductal system, it takes 3 months. Testes produce 200 to 300 million spermatozoa daily.[8] However, only about half or 100 million of these become viable sperm.[9]
Blood Blood accounts for 7% of the human body weight,[3][4] with an average density around 1060 kg/m3, very close to pure water's density of 1000 kg/m3.[5] The average adult has a blood volume of roughly 5 litres (11 US pt),[4] which is composed of plasma and several kinds of cells. These blood cells (which are also called corpuscles or "formed elements") consist of erythrocytes (red blood cells, RBCs), leukocytes (white blood cells), and thrombocytes (platelets). By volume, the red blood cells constitute about 45% of whole blood, the plasma about 54.3%, and white cells about 0.7%.
Prostate The classical description of a healthy human male prostate portrays it as slightly larger than a walnut. The mean weight of the normal prostate in adult males is about 11 grams, usually ranging between 7 and 16 grams.[6] A study stated that prostate volume among patients with negative biopsy is related significantly with weight and height (body mass index), so it is necessary to control for weight.[7] The prostate surrounds the urethra just below the urinary bladder and can be felt during a rectal exam.