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Primary sex character
Secondary sex characteristic - Wikipedia
At the onset of puberty, the hypothalamus causes the release of FSH and LH into the male system for the first time. FSH enters the testes and stimulates the Sertoli cells to begin facilitating spermatogenesis using negative feedback, as illustrated in Figure 1. LH also enters the testes and stimulates the interstitial cells of Leydig to make and release testosterone into the testes and the blood. Figure 1. Hormones control sperm production in a negative feedback system.
Secondary Sex Characteristics: Definition & Explanation
A characteristic, such as breast development, voice pitch, or facial hair, that distinguishes the sexes from each other but is not directly concerned with reproduction. The appearance of these characteristics is influenced by hormones. Do you remember all the words from last week, September 21—27, ? Then this quiz should be butyraceous.
Secondary sex characteristics are features that appear during puberty in humans , and at sexual maturity in other animals. Secondary sex characteristics include, for example, the manes of male lions ,  the bright facial and rump coloration of male mandrills , and horns in many goats and antelopes. These characteristics are believed to be produced by a positive feedback loop known as the Fisherian runaway produced by the secondary characteristic in one sex and the desire for that characteristic in the other sex. Male birds and fish of many species have brighter coloration or other external ornaments. Differences in size between sexes are also considered secondary sexual characteristics.