Hormones - Biology edexcel IGCSE

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Where is Insulin secreted from?

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1

Where is Insulin secreted from?

The pancreas (acts as an endocrine gland)

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2

Insulin controls _____ _________ ______

blood glucose levels

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3

What does insulin stimulate?

It stimulates the muscles, liver and stomach to take up glucose from blood and store as glycogen

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4

Where is adrenaline secreted from?

The adrenal gland

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5

What is the role of adrenaline?

It prepares the body for action

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6

4 effects of adrenaline

  • It increases heart rate

  • it diverts blood flow towards muscles

  • dilation of blood vessels

  • breaking down of stored glucogen

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7

Where is testosterone produced/sourced?

The male testes

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8

What is the role of testosterone?

It stimulates the development of male sexual characteristics

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9

Give 4 examples of male sexual characteristics

  • Production of sperm

  • Facial, body and pubic hair

  • Sexual organs develop

  • Voice breaks

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10

Where is oestrogen sourced?

The female ovaries, in the developing follicle

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11

What is the general role of oestrogen?

It stimulates growth of femal sexual characteristics

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12

Give 3 examples of female sexual characteristics

  • Breasts

  • Pubic hair

  • Beginning of menstrual cycle

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13

Where is progesterone stored/sourced?

Female ovaries - in the corpus luteum

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14

What is the role of progesteron/ it’s effect generally

To maintin the uterine lining during pregnancy

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15

ADH stands for…

Antiduretic hormone

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16

ADH is sourced from the

pituitary gland - the brain

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17

ADH’s role is to…

detect the increase or decrease of blood water levels

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18

If the blood is at a low water level ADH will ____ __________

be released

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19

If ADH is released, when urine passes through the collecting duct it will _______ _____ ______

reabsorb more water

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20

ADH determines the ____-_____ levels and conc. of _____

blood water, urine

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21

Oestrogen in the menstrual cycle stimulates

repair and thickening of the uterus lining

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22

A drop in levels of oestrogen triggers…

Loss of uterus lining

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23

Progesterone in the menstrual cycle…

maintains the uterus lining

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24

Levels of progesterone drop if….

no fertilisation occurs

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25

FSH and LH are produced by the…

pituitary gland

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26

LH in the menstrual cycle stimulates the ovaries to produce what hormone?

progesterone

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27

LH in the menstrual cycle stimulates…

the release of the egg, ovulation

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28

FSH in the menstrual cycle causes the

maturation of the egg in the ovary

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29

FSH in the menstrual cycle stimulates the ovaries to start releasing which hormone?

Oestrogen

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