18. Hormones of Menstrual Cycle, Contraception, IVF and plant hormones Flashcards Preview

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Flashcards in 18. Hormones of Menstrual Cycle, Contraception, IVF and plant hormones Deck (16)
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1

FSH

Produced in: pituitary gland
1. Causes eggs to mature
2. Stimulates the ovary to produce oestrogen

2

Oestrogen

Produced in: ovaries
1. Causes lining of uterus to develop
2. Inhibits the release of FSH
3: Stimulates release of LH

3

LH

Produced in: Pituitary gland
1. Triggers ovulation on day 14

4

Progesterone

Produced in: Ovaries
1. Maintains the lining of the uterus
2. Inhibits the release of both FSH and LH

5

Hormone treatment

FSH and LH can be used as a drug to stimulate ovulation in women with low FSH levels

6

IVF (In Vitro Fertilisation)

Advantage:
-Healthy baby

Disadvantage:
-emotionally stressful
-often unsuccessful
-operation needed
-risky multiple births
-expensive

7

Condoms

Barrier method, stops sperm from reaching egg

Advantage:
-no side effects
-protect against STIs

Disadvantage:
-can get damaged

8

surgical sterilisation

e.g sperm ducts cut/tied (vasectomy) in males, oviducts cut/tied in women

Advantage:
100% effective, permanent

Disadvantage:
surgical procedure requires

9

Intrauterine devices (IUDs)

aka coil, small structure in uterus, lasts 3-5yrs

Advantage:
-v effective
-lasts 3-5 years

Disadvantage:
may cause infections

10

mixed pill

Contains Oestrogen and Progesterone, so inhibits FSH & LH so no eggs mature

Advantage:
-easily accessible
-can be stopped easily

Disadvantage:
-side effects, e.g high blood pressure
-must remember to take

11

The implant

a tiny tube under skin, slowly releases progesterone

advantage:
-99.95% effective

disadvantage:
-lasts only 12 weeks
-can cause side effects

12

phototropism

plant hormone response to light. shoot grows towards light.

13

gravitropism (aka geotropism)

the plant hormone response to gravity. shoots grow away from gravity, roots grow towards gravity

14

Auxin

The hormone which controls plants response the light and gravity

15

Gibberellins

important in seed germination

16

ethene

gas involved in controlling cell division and ripening fruits