Hormonal Coordination P2

Question 1

Hormones in the menstrual cycle

Answer 1

FSH:pituitary:eggs to mature,ovaries produce oestrogen

LH:pituitary gland: release of mature eggs from ovaries (ovulation)

Oestrogen:ovaries:lining of uterus to thicken,FSH inihibits, stimulates release of LH

Progesterone:ovaries:maintains thick uterus lining, inhibits FSH and LH

Question 2

Contraceptives

Answer 2

Oral: contains hormones to inhibit FSH production so no eggs mature.
Barrier contraceptives-condoms and diaphragms
Intrauterine devices-prevents implantation of embryo or releases hormones like oral contraceptives

Injection implants or skin patch:slow release of progesterone
Spermicidal agents
Chastity
Surgical methods of sterilization

Question 3

IVF

Answer 3

Mother is given FSH and LH
Eggs collected and sperm collected
Fertilized in a lab
Embryo develops and is placed in mother uterus.

Question 4

Plant hormones

Answer 4

Auxins-plant growth regulator used in weed kill and rooting powered and growth in tissue cultures
Ethene- hormone that controls cells division. Controls ripening of fruit during storage and transport.
Gibberellins. Regulates developmental processes including initiating seed germination.
Ends seed dormancy, promote flowering, and increase fruit size