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Biology > B11 > Flashcards

B11 Flashcards

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1
Q

How long is menstrual cycle

A

28 days

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2
Q

Where is FSH and LH made

A

Pituitry gland

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3
Q

Where is oestrogen and progesterone made

A

Ovaries

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4
Q

What is the order

A

FSH
Oestrogen
LH
Progesterone

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5
Q

Main events in cycle and what they do

A 
MENSTRUATION= uterus linning breaks down, blood and cells are lost. Lasts from day 1-6
PROLIFERATION= repair of the lining. Proliferation starts from day 7-13
OVULATION= release of an egg from the ovary. Always happens on day 14. Release of the egg
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6
Q

What happens between day 1-6 (menstruation)

A

Ovaries-follicles immature
Uterus-uterus lining breaks
Hormone levels-pituatry gland releases FSH

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7
Q

What does FSH do

A

It matures and develops eggs in ovaries

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8
Q

Days 6-13 (proliferation)

A

Ovaries-eggs begin to develop

Uterus-uterus lining repairs

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9
Q

What does oestrogen do

A

Stops FSH
Starts LH release
Uterus lining thickens

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10
Q

Day 14 (ovulation)

A

Ovaries-follicle releases egg
Uterus-uterus lining remains thick
High Lh level cause follicle to burst and releases egg into oviduct

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11
Q

LH starts releasing Progesterone

A

Progesterone maintains thick uterus lining

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12
Q

What does thick lining do

A

Provides nutrients and oxygen to egg

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13
Q

LH on graph

A

On day 14 it has high amounts. Else there is veey little amount

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14
Q

Oestrogen on graph

A

Increases on day 10 (proliferation)
Causes reperation of lining
Develops egg

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15
Q

What happens after day 14

A

Progesterone increases because it wants preganancy. It mantains thick uterus lining hoping for fertilisation.

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16
Q

Which hormone causes the egg to mature

A

FSH

17
Q

Which hormone starts to be released around day 5

A

FSH

18
Q

Name a hormone that is NOT released by the pituitry gland

A

Oestrogen

Progesterone

19
Q

Hoe does FSH get from the pituitry gland to the ovaries

A

Blood

20
Q

What effect does oestrogen have on FSH

A

It stops it

21
Q

What does LH do

A

Stops oestrogen
LH releases the egg in ovaries
Stimulates progesterone
Day 14

22
Q

Which two hormones are not contained in the contraceptive pill

A

FSH

LH

23
Q

What happens at the end of menstrual cycle

A

Lining breaks
Bleeding
No hormones needed

24
Q

Which hormone causes uterus lining to build up

A

Oestrogen

25
Q

Describe the roles of FSH and LH

A

FSH develops egg and starts to release Oestrogen

LH stops oestrogen and causes release of an egg

26
Q

Use of plant hormones

A

Agriculture and horticulture

Auxins can be used as weed killers and rooting powders

27
Q

What is ethen used for

A

Controls fruit ripening

28
Q

What are giberellins and uses

A

Can be used to increase fruit size, increases yield in sugar cane and promotes flowering

Biology (11 decks)

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