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19 Cards in this Set
- Front
- Back
testes
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or male gonads, are the primary reproductive organs in males. The testes have an exocrine (sperm-producing) function and an endocrine (testosterone-producing) function.
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The _________ provides a temporary storage site for the immature sperm that enter it from the testis.
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epididymis
The sperm mature as they go through the epididymis. Sexual stimulation causes the epididymis to contract and expel the sperm into the ductus deferens. |
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The ____________ _______, is enclosed, along with blood vessels and nerves, in a connective tissue sheath called the ____________.
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ductus deferens, or vas deferens
spermatic cord |
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The ductus deferens empties into the ____________ which merges with the urethra.
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ejaculatory duct
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During __________ the thick layers of smooth muscle in its walls create peristaltic waves that rapidly squeeze the sperm forward.
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ejaculation
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The accessory glands include...
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the paired seminal vesicles, the single prostate, and the bulbourethral glands.
These glands produce the bulk of semen, the sperm-containing fluid that is propelled out of the male's reproductive tract during ejaculation. |
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The ____ encircles the upper part of the urethra and secretes a fluid that also plays a role in activating sperm.
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prostate
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The _______ ______ produce thick. clear mucus that drains into the penile urethra and is the first secretion when a man becomes sexually excited.
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bulbourethral glands
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________ is a milky white mixture of sperm and accessory gland secretions.
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Semen
The liquid portion acts as a transport medium for nutrients and chemicals that protect the sperm and aid their movement. There are between 50 and 150 million sperm in each ml of semen. |
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The male external genitalia include the _______ and the ________.
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scrotum
penis |
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The _______ is a divided sac of skin at the root of the penis.
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scrotum
The scrotum hangs loosely from its attachments, and provides the testes with a temperature below body temperature and ideal for sperm production. |
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The _______ is designed to deliver sperm into the female reproductive tract.
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penis
The penis consists of a shaft, which ends in an enlarged tip, the glans penis. The skin covering the penis is loose, and it folds downward to form a cuff of skin, the prepuce, or foreskin, around the proximal end of the glans. |
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The _________ ________ is surrounded by three elongated areas of erectile tissue, a spongy tissue that fills with blood during sexual excitement.
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spongy urethra
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Meiosis
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is a type of nuclear division that occurs in the gonads.
Meiosis consists of two successive divisions of the nucleus, instead of only one division. It results in four daughter cells, or gametes. |
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In spermatogenesis, the gametes are called __________.
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spermatids
Spermatids have half as much genetic material as other cells. In humans, this is 23 chromosomes rather than the usual 46. Then, when the sperm and the egg (which also has 23 chromosomes) unite, forming the fertilized egg, or zygote, the normal number of 46 chromosomes is reestablished. |
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In the last stage of sperm development, all excess _______ is sloughed off, and three regions of a mature sperm remain including the head, midpiece, and tail.
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cytoplasm
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The sperm head contains compacted DNA, the genetic material, or nucleus. Anterior to the nucleus is the _______.
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acrosome
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The process from the formation of a primary spermatocyte to release of immature sperm in the tubule lumen takes _______days.
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64‒72
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The interstitial cells produce ___________, the most important hormonal product of the testes. During puberty the interstitial cells are activated by ______________.
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testosterone
luteinizing hormone (LH) |
