Theme 1: The Reproductive System Flashcards
What is the primary function of male reproductive system?
The production and maintenance of spam
The production of transport fluid called semen to transport sperm
The discharge of sperm during sexual intercourse
Production and and secretion of male specific reproductive hormones
What is the primary function of female reproductive systems
The production and development of a fetous after impregnating
Production of milk to nourish a newly born baby
Maintaining a monthly cycle to prepare the uterus to receive a fertilised egg - the menstrual cycle
Label this diagram of female reproductive tract
A - Fallopian tube
B - uterine tube
C - Fimriae
D - Ovary
E - endometrium
F - myoetrium
G - cervix
H - vagina
Label this diagram of the male reproductive tract
A - urinary bladder
B - vas deferens
C - urethra
D - penis
E - seminal vesicle
F - rectum
G - anus
H - Prostate
I - epididymis
J - testes
K - scrotum
What key changes occur in males through puberty
- sperm cell production (spermatogenesis) leads to seminal discharge - development of seminal vesicles
- testicular and penis growth
- axilla and pubic hair growth
- skeletal and muscle growth
- changes in sweat and sebaceous glands
- changes in labido
What are key changes in puberty for females
- production of egg cells
- enlargement of breasts, vagina and uterus
- skeletal growth and widening of the pelvis (caused by androgens from adrenal glands)
- axilla and pubic hair growth
- changes in sweat
- changes in labido
What is they key concept of spermatogenesis
Spermatogenesis is a continuous process that starts from puberty and will last until end of life
100 million sperm a day
- Sperm stem cell goes through mitosis to form primary spermatocytes (46 chromosomes)
- Meiosis occurs phase 1 which creates secondary spermatocytes (23 chromosomes)
- Further meiosis produce spermatids
This happens in the seminiferous tubules in the testes and it will mature into sperm cell over 65-75 days
What is the key concepts of oogenesis
Oocytes - the female gamete germ cells (immature eggs)
Focilies - proactive structures formed in the ovaries that allow oocytes to develop and mature
Female is in uterus Oogonia multiple via mitosis to crease 2-4milling oogonia
> some will start meiosis phase 1 and the rest degenerate
> primary oocytes develop into primary follicles to develop is (made of single layer of granulosa cells)
> the oocyte in uterine has pairs of chromosomes one maternal and one paternal
> around 1 million follicles contains oocytes left
>when puberty hits around 300,000 remains as they degenerate overtime
>LH and FSH hormones trigger primary follicles to devolving into secondary follicle
>meiosis that is paused continues and meiosis 1 continues which leaves another copy of the prepare oocyte called polar body which dies
> meiosis 2 occurs which allows oocyte to mature to Graafian follicle and pauses at metaphase 11
> if Graafian follicle is fertilised by sperm meiosis 2 is completed and turns into ovum
What are sperm?
Sperm is the male gamete cell that fertilises the female egg.
Consists of 4 main parts»_space;> The head, Neck, middle piece and tail
Head —— contains nucleolus + enzymes that penetrate egg cell
Neck ——- mitochondria for energy to swim
Tail ——— cell movement through female system
Can last 48hrs after ejaculation
Label this sperm cell
A - tail (flagellum)
B - plasma membrane
C - middle piece
D - head
E - Acrosome
F - nucleus
G - centriole
H - Neck
I - mitochondria
What is the penis?
Part of genitourinary tract (reproductive and urinary system) as sperm and urine pass through urethra
Penis is ->
Attached root that connects shaft and tip
Glans penis - tip of penis
Foreskin - skin that covers glans penis
Inside ->
Eric tile tissue : Spongy network of connective tissue and blood vessels
Label this diagram of penis
A - corpus cavernosum
B - corpus spongiosum
C - shaft
D - glans
E - foreskin
F - Meatus
G - Root
H - urethra
What are the testes and scrotum?
The testes are the place where sperm are produced
- a pair of testes within a scrotal sac
- testes hand outside of body as sperm need to maintained at 3 degrees lower than core body (35)
- 250 wedge shaped lobules that consist of 4 tightly coiled seminiferous tubules.
- Spermatogenic cells are there (called Leydig cells) these cells produce and secrete testosterone
-scrotal sac is able to contract or relax to pull away/towards body in response to temperature
Label this diagram of the testes
A - epididymis
B - blood vessel
C - testis
D - scrotum
What is the male duct system?
The male duct system starts from the epididymis and ends int he urethra where seems and sperm are ejaculated.
EPIDIDYMIS is a comma shaped ducted that is coiled and made up of cilla, epithial tissue and smooth muscle
During sex, mature sperm cells from the epididymis into the vas defers thanks to peristaltic action generated by the smooth muscle contractions transport sperm to the ejactlatory ducts which enter the prostate gland before being discharged into the urethra