Biology 12 Worksheet - Male Reproductive System (Page 2 of 4) in pdf

Biology 12 Worksheet - Male Reproductive System Page 2

2) What is the difference between semen and seminal fluid? List the contents of semen in a

chart that indicates the function of each component and the gland or structure that

produces it.

Seminal fluid = secretions from seminal vesicles, prostate gland and bulbourethral gland

Semen = sperm + seminal fluid

GLAND/

CONTENT

FUNCTION

STRUCTURE

testes

sperm

Fertilize the egg

fructose

nourish sperm

seminal

vesicles

milky alkaline

helps sperm survive in the acidic vaginal canal

prostate

fluid

gland

lubricant

aids in sperm motility

bulbourethral

gland

3) Describe the process of spermatogenesis. Be sure to indicate precisely where it occurs in

the testes, and the functions of the hormones LH, FSH and testosterone in its production.

Within the seminiferous tubules the spermatagonia divide by mitosis and become primary

spermatocytes. Primary spermatocytes divide by meiosis (46 chromosomes

chromosomes) to become spermatids (immature sperm). Spermatids are nourished by

the seritoli cells and develop to become functional sperm. Mature sperm are stored in

the epididymis.

FSH acts on spermatogenic cells within the seminiferous tubules to causing them to take in

testosterone.

LH act on the interstitial cells causing them to produce testosterone

Testosterone acts on spermatogenic cells causing them to produce sperm (promotes

spermatogenesis)

4) List in order the path of a single sperm cell from a seminiferous tubule to the urethral

opening.

Seminiferous tubule

interstitial cells

epididymis

vas deferens

urethra

urethral

opening

5) Create a flow chart which summarizes hormonal control of the testes. Then, in a concise but

thorough paragraph, describe the control of testosterone levels by the endocrine system.

Be sure, in your description, to explain the roles of the hypothalamus, pituitary, GnRH,

LH(ICSH), FSH, interstitial cells, testosterone, and inhibin. Be sure to clearly indicate how

negative feedback operates in this loop.

See Notes p. 3 and text book p. 419

Biology 12 Worksheet - Male Reproductive System Page 2

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