Human Reproduction - Hormanal Control

Question 1

Hormone during menstrual cycle

Answer 1

Follicular stimulating hormone (FSH)
-by AP gland, stimulate follicles development
-stimulate oestrogen secretion

Oestrogen
-by ovary or corpus luteum
-thicken lining of endometrium for implantation
-stimulate lutenising hormone
-inhibit FSH secretion (1 follicle each menstrual)

Lutenising hormone (LH)
-ejection of secondary oocyte
-follicle -> corpus luteum

Progesterone
-by corpus luteum, maintain endometrium lining
-inhibit FSH + LH secretion

Question 2

Hormone during fertilisation + implantation

Answer 2

hCG
-by diploid gamete
-prevent complete dissolve of corpus luteum
-progesterone + oestrogen keep secreting

hCG also checked for pregnancy check

Fetal development - placenta secrete hormone
-progesterone: prevent lactation (inhibit prolactin)
-oestrogen: allow baby organ development

Oxytocin: labour, positive feedback

Question 3

Hormone after pregnancy

Answer 3

Oxytocin
-PP gland
-allow milk to flow to nipple via contraction

Prolactin
-PP gland
-Milk production

Question 4

Placenta

Answer 4

Tissue between chorion + mother blood vessel, exchange waste + nutrients

Villi
-hair on end of umbilical cord to exchange things in placenta (high SA)

Umbilical artery
-bring deoxygenated blood away from baby

Umbilical vein
-bring oxygenated blood to baby

Counter current flow, high pressure from mother artery prevent equilibrium

Mother blood + baby blood can’t mix - trigger immune response or exchange toxin

Question 5

Placenta diagram

Answer 5

https://resource.download.wjec.co.uk/vtc/2020-21/el20-21_1-1/images/eng/4.1_human_reproduction_image_10.png

Question 6

Spermatogenesis + hormone

Answer 6

LH - stimulate Leydig cell to secrete testosterone

FSH + testosterone- start spermatogenesis