repro in humans

Question 1

what is puberty?

Answer 1

the stage of human growth and development in which a person becomes physically mature

Question 2

secondary sexual characteristics for males

Answer 2

1. penis and testicles increase in size
2. larynx enlarges and voice deepens
3. production of sperms starts

Question 3

secondary sexual characteristics for females

Answer 3

1. breasts and uterus enlarge
2. hips broaden
3. menstruation and ovulation start

Question 4

menstruation

Answer 4

• uterine lining breaks down and flows out of the body through the vagina
• the anterior pituitary gland secrets fsh

Question 5

follicle stage

Answer 5

fsh stimulates
1. follicle development in the ovaries
2. oestrogen secretion by the follicles

oestrogen causes the repair and growth of the uterine lining

a high conc of oestrogen in the blood
1. inhibits fsh production, preventing the maturation and growth of more follicles
2. stimulates pituitaryov gland to secrete lh

Question 6

ovulation

Answer 6

lh causes ovulation and the formation of corpus leteum

an ovary releases an egg into oviduct

Question 7

aft ovulation

Answer 7

progesterone is released
prevents ovulation and further development of eggs
causes uterine lining to thicken further, preparing it for the implantation and growth of an embroyo

oestrogen levels decrease
if no fertilisation occurs, progesterone production decreases