Hormonal Coordination B Flashcards
How often are egg cells released?
~Every 28 days
Where is FSH (follicle stimulating hormone) released from?
The pituitary gland.
What does FSH do?
Causes maturation of eggs, stimulates ovaries to produce oestrogen
Where is LH (luteinising hormone) released from?
Pituitary gland
What does oestrogen do?
Thickens uterus lining, inhibits FSH release, stimulates LH release.
Where is progesterone released from?
The ovaries.
What does progesterone do?
Maintains uterus lining, inhibits release of FSH and LH.
What happens during IVF treatment?
- Mother given FSH and LH to stimulate maturation of several eggs.
- Eggs collected from mother and fertilised by sperm of father in a lab.
- Fertilised eggs develop into embryos.
- Embryos inserted into mother’s uterus while still tiny balls of cells.
Name 3 disadvantages of IVF.
- Emotional and physical stress
- Low success rate
- Can lead to multiple births
What is phototropism?
The orientation and growth of plants in response to light.
What is gravitropism?
The growth of plants in response to gravity.
What do auxins do?
Regulate plant growth - unequal auxin distribution leads to unequal growth rates in roots and shoots
What does ethene do?
Acts as hormone to control cell division.
What do gibberellins do?
Regulate developmental processes like seed germination
Give an agricultural use of auxins.
Weedkiller, rooting powder, promoting growth in tissue cultures
Give an agricultural use of ethene.
Controls ripeness of fruit in storage
Give an agricultural use of gibberellins.
End seed dormancy, promote flowering, increase fruit size
What does LH do?
Stimulates release of egg cell
What hormone maintains the uterus lining?
Progesterone
What hormone thickens the uterus lining?
Oestrogen
Which hormones are released from the pituitary gland?
LH, ADH, FSH, thyroxine
Which hormones are released by the ovaries?
Oestrogen, progesterone
