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Testicle
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<p>A testicle or testis (pl. testes) is the <a href="/facts/Gonad/36BUam2x">gonad</a> in all male <a href="/facts/Bilateria/nfUwVYrx">bilaterians</a>, including humans, and is <a href="/facts/Homology_(biology)/muctKlyT">homologous</a> to the <a href="/facts/Ovary/z2hG6bNy">ovary</a> in females. Its primary functions are the production of <a href="/facts/Sperm/RCxpXygQ">sperm</a> and the secretion of <a href="/facts/Androgen/Rxey0HxX">androgens</a>, primarily <a href="/facts/Testosterone/uUumdhAz">testosterone</a>. </p><p>The release of testosterone is regulated by <a href="/facts/Luteinizing_hormone/a6znte2S">luteinizing hormone</a> (LH) from the <a href="/facts/Anterior_pituitary_gland/uUj4jzRq">anterior pituitary gland</a>. Sperm production is controlled by <a href="/facts/Follicle-stimulating_hormone/n6CwdebD">follicle-stimulating hormone</a> (FSH) from the anterior pituitary gland and by testosterone produced within the gonads. </p>