The Male Reproductive System

Question 1

What are the 3 parts of the testes ?

Answer 1

Seminiferous tubules , efferent ducts and the epididymis

Question 2

What is the function of the seminiferous tubules ?

Answer 2

Site of the start of spermatogenesis

Question 3

What is the structure of the seminiferous tubules ?

Answer 3

Contains sertoli and germ cells which produce sperm and secrete hormones.

Question 4

What is the function of the epididymis ?

Answer 4

Sperm storage and maturation

Seminiferous tubules drain into here via the efferent duct

Question 5

What happens to the germ cells within the seminiferous tubules ?

Answer 5

Undergo spermatogenesis to give rise to spermatids

Question 6

What happens to the sertoli cells within the seminiferous tubules ?

Answer 6

Secrete oestrogen and nutrients for the sperm

Question 7

What happens to the leydig cells outside of the seminiferous tubules ?

Answer 7

Secrete testosterone

Question 8

What is the function of the Vas Deferens / Ductus deferens ?

Answer 8

Transports sperm from the epididymis to the urethra

Question 9

What is the function of the Urethra ?

Answer 9

Transports sperm and urine to the exterior

Where the reproductive and urinary system meet

Question 10

What is the function of the Penis ?

Answer 10

Copulation organ
Convey sperm and fluids from the male to the female reproductive tract
Coneys urine from the bladder to the outside of the body

Question 11

What is the structure of the Penis ?

Answer 11

Os penis of both cats and dogs contains a small bone
Covered with erectile tissue
Covered with a prepuce (foreskin) for protection
End of the penis is called the glans penis

Question 12

What is unique about a dogs penis ?

Answer 12

They have a structure at the base of the penis which is called the bulbus glandis , this is not normally visible but will swell up during mating which produces the tie .

Question 13

What is the structure of the Os penis ?

Answer 13

Three columns of spongy erectile tissue (usually 3 cavities) which can be engorged with blood by simultaneous arterial dilation and venous constriction (hydraulic erection)

Question 14

Name the 3 accessory glands within the male reproductive tract .

Answer 14

Prostate gland
Bulbourethral gland
Seminal vesicle

Question 15

What is the function of the Prostate gland ?

Answer 15

Secretary prostate fluid, part of seamen.

Question 16

What is the structure of the Prostate gland ?

Answer 16

Bilobed structure on the floor of the pelvis, surrounding urethra.

Question 17

What is the function of the Bulbourethral gland ?

Answer 17

Produce some ejaculate fluid which also acts as a flushing agent for the urethra and provides lubrication. Not present in the dog.

Question 18

What is the function of the Seminal vesicle ?

Answer 18

Secrete a nutrient fluid to nourish and activate sperm.

Question 19

What is the function of GnRH Gonadotropin releasing hormone and where is it produced ?

Answer 19

Light stimulates pineal gland - reduces melatonin secretion. Allowing GnRH to be secreted and stimulates LH and FSH.
Controls other reproductive hormones
Secreted by hypothalamus (the anterior pituitary)

Question 20

What is the function of Luteinising hormone (LH) and where is it produced ?

Answer 20

Stimulates the production of testosterone from Leydig cells in the testes.
Anterior pituitary gland

Question 21

What is the function of Follicle stimulating hormone and where is it produced ?

Answer 21

Helps control sperm production.

Anterior pituitary gland

Question 22

What is the function of Testosterone and where is it produced ?

Answer 22

Development of sex organs tissues and secondary sexual characteristics.
Testes

Question 23

What is the function of Androgen-binding hormone and where is it produced ?

Answer 23

Helps maintain high levels of testosterone in the testes.

Seminiferous tubules