ohU 3. These cells will undergo Meiosis I which will result in two daughter cells with half the number of chromosomes (haploid= 23) called SECONDARY
SPERMATOCYTES. 4. The two SECONDARY SPERMATOCYTES enter into MEIOSIS II forming 4 SPERMATIDS with half of
the number of chromosomes. Pair up the appropriate label and annotation:
5. Once MEIOSIS is completed the SPERMATIDS must differentiate into a fully functioning SPERMATAZOA. a. Head- contains the nucleus and the ACROSOMEorganelle that contains hydrolytic or digestive enzymes to penetrate the egg.
b. Midpiece- with helical mitochondria for ATP production. c. Flagella- whip- like tail made up of microtubules used for motility.
Label: 6. The developing sperm cells need nutrients during
this period of differentiation and attaches to the specialized nurse cells called
SERTOLI CELLS. 7. Each of the stages of meiosis have moved the resulting cells closer to the fluid filled lumen of the seminiferous tubule.
8. The SPERMATIDS are swept up into the EPIDIDYMIS where they will be stored. C. Hormonal Control of
1. LH (secreted by Spermatogenesispituitary) stimulates LEYDIG cells to produce testosterone. 2. FSH (secreted by
pituitary) stimulate the meiotic division of primary spermatocytes into secondary
spermatocytes. 3.TestosteroneDevelopment of secondary spermatocytes into mature sperm.
SUMMARY: Semen production Maturing sperm are passed onto a
long coiled tube, the EPIDIDYMIS (upper rear part of each testis) where they further mature, become motile, and are stored until ejaculation.
( about 20 days) (About 400 MILLION sperm produced each day.)
Exocrine glands produce secretions for the transport of sperm called SEMEN. a. SEMINAL VESSICLE- provides a
sugar (fructose) rich fluid used to nourish the sperm and provide energy and mucus for protection. b. PROSTATE GLAND - alkalineneutralizes acidic environment of female.
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