Exam 4: Male Reproductive System Flashcards Preview

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Flashcards in Exam 4: Male Reproductive System Deck (38)
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1

Gonads

testes in the male, ovaries in the female
-functions: produce gametes (sex cells): sperm or oocytes, produce sex hormones

2

Accessory Reproductive Organs

- include "ducts" that transport/store the gametes, glands that secrete substances for the gametes' well-being, and the external genitalia

3

Reproductive System and Puberty

-not fully formed until then
-at puberty hypothalamus secretes hormones that tell anterior pituitary to release FSH (follicle stimulating hormone) and LH (luteinizing hormone), which act on ovaries and testes
-so you need FSH and LH to start gamete maturation and increased sex hormone production by the gonads
-hypothalums-->anterior pituitary-->FSH and LH-->gonads

4

Testis Function and External Anatomy

-functions: produce sperm and produce androgens (male sex hormones)
-suspended in scrotum

5

Scrotum

-function: keeps testes 3 degrees C cooler than internal body temperature so sperm can be produced (if too warm, sperm won't develop)

6

Spermatic Cord

-runs from each testis to abdomen
-contains blood vessels and nerves and the ductus (vas) deferens

7

Testis Internal Anatomy

-each testis divided into a series of internal compartments called lobules
-each lobule contains up to 4 seminiferous tubules within the seminiferous tubules are: spermatogonia, developing sperm Sustentacular cells
-between seminiferous tubules is some connective tissue, with interstitial cells

8

Spermatogonia

-sperm stem cells or parent cells
-at base/edge of seminiferous tubules

9

Sustentacular Cells

-nurse cells/sertoli cells
-nourish and support developing sperm

10

Intersticial Cells

-function: produce androgens

11

Sperm Production

-sex cells (gametes) created by MEIOSIS
-end result of meiosis: 4 cells produced, each w/23 chromosomes only!
-Meiosis I: DNA replicated and homologous chromosomes split (haploid at end) Meiosis II: sister chromatids split forming 4 new haploid cells

12

Cell Division in Males

-spermatagonia divide by MITOSIS and make primary spermatocytes which divide by MEIOSIS making secondary spermatocytes, divide in MEIOSIS II making spermatids which develop into sperm

13

Spermatogonia

-23 pairs of chromosomes (46 total)
-divide by mitosis
-diploid

14

Primary Spermatocytes

-23 pairs of chromosome (46 total)
-diploid
-divide by meiosis I

15

Secondary Spermatocytes

-contain only 23 chromosomes
-haploid
-divide by meiosis II

16

Spermatids

-immature sperm
-contain only 23 chromosomes

17

Sperm

--develop from spermatids
-sperm will shed the cytoplasm from spermatid and develop a head, midpiece, and tail
-sperm then released from sustentacular cell cytoplasm and enter lumen of seminiferous tubule
-look mature but not fully motile

18

Head of Sperm

-contains DNA
-has acrosome cap which contains digestive enzymes to penetrate oocyte
-no mitochondria in head (all from mom)

19

Midpiece of Sperm

-contains mitochondria

20

Tail of Sperm

-moves sperm

21

Epididymis

-comma-shaped organ located posterior to an don top of testis
-receive sperm from testis
-functions: place where sperm become fully motile and stores sperm until they are ejaculated

22

Ductus (Vas) Deferens

-18 inch long tube that runs from testis to prostate gland
- part of its travel is within the spermatic cord
- then it enters the abdominopelvic cavity, winds around the bladder, and is found near the prostate gland
ductus deferens will "merge" with the duct in the seminal vesicle to form the ejaculatory duct

23

Ejaculatory Duct

-each one will empty its contents into the urethra

24

Accessory Reproductive Glands

-function of these glands: to produce a nutritive, alkaline fluid (seminal fluid) to the sperm
-sperm + seminal fluid = semen

25

Vasectomy

-both ducti deferens cut and tied in a segment
-sperm not ejaculated but resorbed in to epididymis
-can still ejaculate but only the seminal fluid (not sperm)

26

Seminal Fluid

-nourishes sperm
-alkaline to neutralize acidity of vagina

27

Seminal Vesicles

-each lies on posterior wall of bladder
-each has a "duct" that merges with the ductus deferens, to form ejaculatory duct
-produces one part of seminal fluid

28

Prostate Gland

-single, chestnut-shaped organ
-inferior to bladder
-contains the 1st part of the urethra (prostatic urethra)
-produces another part of seminal fluid

29

Bulborethral Glands

-each gland is pea-shaped
-lies within urogenital diaphragm
-produces 3rd park of seminal fluid

30

Penis

-is part of the external genitalia
-two main functions: excretes urine and delivers semen to female reproductive tract
-3 parts: root, body, glans