Adrenaline: is produced by adrenal glands (above the kidney) and is released in times of excitement, fear or stress. Adrenaline helps prepare the body for action in the following ways:
- Glycogen is converted to glucose in the liver, so more glucose reaches the muscles as a source of energy for the rapid contractions needed for sudden action
- Increases heart rate so that more glucose and oxygen are delivered to the muscles for energy release
- The bronchioles widen so that more air reaches the lungs
- Blood vessels to the brain widen so that more glucose and oxygen is delivered to these organs
- Blood vessels to the gut and other organs narrows allowing blood to be diverted to more life-saving organs
- Hairs are raised
ADH: is made in a gland in your brain and controls the level of water in your body.
Insulin: The pancreas makes insulin. The insulin tells the liver to take glucose out of your blood so it is changed into glycogen in the liver . Insulin lowers blood glucose(sugar) levels back to normal
Testosterone & Oestrogen are hormones that bring about the changes to our bodies that occur at puberty
Testosterone is the male hormone and brings out these changes in boys:
- the testes start making sperms
- hair starts to grow on the face and body
- The voice deepens
- the muscles develop
Oestrogen is the female hormone and brings out these changes in girls:
- The ovaries start to release eggs
- hair starts to grow on parts of the body
- the breasts develop
- the hips widen
- periods start
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