Lecture 33- Testes And Penis

Question 1

Primary sex organs

Answer 1

Ovaries and testes

Produce gametes- ova and sperm

Question 2

Sex hormones

Answer 2

Androgens from testes and estrogens and progesterones from ovaries

Question 3

Accessory reproductive organs

Answer 3

Ducts ad glands and external genitalia

Question 4

Scrotum

Answer 4

Sac of skin that houses the testes
Provides temperature appropriate environment for sperm
Responds to temperature changes- wrinkles and close to body when cold and loose when too warm

Question 5

Testes

Answer 5

Primary reproductive organ, produces sperm and testosterone

Question 6

Leydig cells

Answer 6

Produce androgens (testosterone)

Question 7

Sertoli cells

Answer 7

Promote sperm production by her, cells and form blood-testis barrier

Question 8

Pampiniform venous plexus

Answer 8

Surrounds testicular artery, absorbing heat to maintain temp.

Question 9

Spermatic cord

Answer 9

Contains autonomic nerve fibres, blood vessels and lymphatics ands passes through the inguinal canal to each testis

Question 10

Follicle stimulating hormone

Answer 10

Indirectly stimulates spermatogenesis

Question 11

Lutenizing hormone

Answer 11

Stimulates leydig cells to produce testosterone

Question 12

Inhibin

Answer 12

FSH inhibiting protein released by Sertoli cells, and when sperm count is too high

Question 13

Testosterone

Answer 13

Targets accessory organs,initiating spermatogenesis, and ducts,glands and the nis causing them to grow to adult size and function

Can induce male secondary sex characteristics - pubic, axillary and facial hair, deepening of voice etc.

Question 14

Epididymis

Answer 14

6 metres long
Place for immature sperm to develop until expelled during ejaculation

Question 15

Ductus deferens

Answer 15

Part of spermatic cord from epididymis, through inguinal canal into pelvic cavity and into ejaculatory duct and passes through prostate to join urethra

Question 16

Urethra(male)

Answer 16

Carries both urine and sperm to exterior environment

Question 17

Seminal glands

Answer 17

Posterior to bladder wall

Alkaline secretion accounts for 70% volume of semen
Contains fructose, ascorbic aid, coagulating enzyme and prostaglandins

Question 18

Prostrate gland

Answer 18

Encircles urethra, inferior to bladder, responsible for producing milky, slightly acidic fluid that comprises up to one third of semen and plays role in sperm activation

Question 19

Bulbourethral glands

Answer 19

Produce thick, clear mucous prior to ejaculation that neutralizes any acidic urine in urethra

Question 20

Semen

Answer 20

Milky, white, somewhat sticky mixture of sperm and accessory gland secretions that provide transport medium for sperm

Question 21

Penis

Answer 21

Copulatory organ

Made of attached root and free body that ends in enlarged tip

Question 22

Foreskin (prepuce)

Answer 22

Covers penis and may be slipped back to form cuff around tip (glans)

Question 23

Circumcision

Answer 23

Surgery to remove foreskin

Question 24

Three cylindrical bodies of penis

Answer 24

Corpus spongiosum- surround urethra
And paired copra cavernosa

Question 25

Erection

Answer 25

Caused by enlargement of erectile tissues with blood during sexual arousal

Question 26

Ejaculation

Answer 26

Propulsion of semen triggered by sympathetic nervous system