5.3.4 Hormones in human reproduction Flashcards
1
Q
What do reproductive hormones cause during puberty?
A
secondary sex characteristics to develop
2
Q
What is the main female reproductive hormone? Where is it produced?
A
3
Q
Ovulation
A
release of a mature egg from the ovary approximately every 28 days
4
Q
What is the main male reproductive hormone? Where is it produced? What does it stimulate?
A
5
Q
What hormones are involved in the menstrual cycle of woman?
A
- Follicle stimulating hormone (FSH)
- Luteinising hormone (LH)
- Oestrogen
- Progestrone
6
Q
Follicle stimulating hormone (FSH)
A
- secreted by pituitary gland
- causes maturation of an egg in the ovary
- stimulates ovaries to produce hormones (eg. oestrogen
7
Q
Luteinising hormone (LH)
A
- secreted by pituitary gland
- stimulates the release of the egg from ovary
- levels fall again once ovulation has taken place
8
Q
Oestrogen
A
- made + secreted by the ovaries in response to FSH
- stimulates lining of uterus to grow again after menstruation in preparation for pregnancy
- inhibits production of more FSH + stimulates release of LH when oestrogen levels are high
9
Q
What are babies born with?
A
primary sexual characteristics
- ovaries in girls
- testes in boys
10
Q
Secondary sex characteristics of woman
A
- growth spurt
- growth of pubic hair
- breast development
11
Q
Menstrual cycle
A
- each month: eggs begin to mature in the ovary + uterus produced thickened lining ready for pregnancy
- ovulation
- if egg not fertilised, lining + egg shed around 14 days later
12
Q
Secondary sex characteristics of males
A
- growth spurt
- growth of pubic hair
- facial hair
- underarm hair
- voice breaks
13
Q
Progesterone
A
- secreted by empty egg follicle in the ovary after ovulation
- helps to maintain a pregnancy if the egg is fertilised
- inhibits FSH and LH
- maintains lining of the uterus
