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Gonads begin to develop
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5 to 6 weeks after fertilization.
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The gene that codes for the testis-determining factor (TDF) is found in or on
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The Y chromosome.
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The penis is homologous to
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The clitoris
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The _____________ is the gonad and the ___________ is the gamete.
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Testis; sperm
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________________ stimulates the descent of the testes.
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Testosterone
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What structure located near the bulb of the inner end of the penis of the male reproductive tract, produces a clear lubricating fluid that also neutralizes the pH of the urine in the urethra?
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Bulbourethral gland
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What structure surrounds the urethra and ejaculatory duct of the male reproductive tract, is about 3 cm in diameter, contains 30-50 tubuloacinar glands, and is enclosed in a single fibrous capsule?
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Prostate gland
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What structure of the male reproductive tract consists of a muscular tube, about 2.5 mm in diameter, that extends from the testes up through the spermatic cord, and eventually merges with the duct of the seminal vesicles?
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Ductus (vas) deferens
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What single erectile body passes along the ventral side of the penis, surrounds the urethra, and expands at the distal end to fill the glans of the penis?
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Corpus spongiosum
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From their formation to ejaculation, sperm cells take the following pathway:
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Seminiferous tubule, rete testis, epididymis, ductus deferens, ejaculatory duct, urethra.
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When it is cold, the _____________ contracts and draws the testes closer to the body to keep them warm.
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Cremaster muscle
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The countercurrent heat exchanger that prevents arterial blood from overheating the testes is
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The pampiniform plexus.
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The blood-testis barrier
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Prevents antibodies in the blood from getting to the germ cells
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By volume, most of the semen is produced in the
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Seminal vesicles.
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_____________ are found in the seminiferous tubules.
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Interstitial (Leydig) Cells, Germ Cells, Sustentacular (Sertoli) Cells, Spermatids
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