Hormones and glands in human body
The diagram below shows the hormones in human body
Adrenaline is a hormone secreted by the adrenal gland. 
Roles of adrenaline
It increases pulse rate, makes the glycogen in muscles get converted to glucose (Increases concentration of glucose in the blood for respiration), and ...
... released into blood, makes you breath deeper and more rapidly, ...
... airways become wider, and makes skin become pale as blood is diverted away 
Adrenaline is secreted when ...
- bungee jumping
- riding a rollercoaster 
Differences between hormones and nerves
Like the nervous system, hormones can control the body.
There are important differences between the two systems as described in the table. 
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