1. HORMONES
Chemical messengers
© 2016 Paul Billiet ODWS

2. Thyroxin Produced by the thyroid gland
It stimulates metabolic rate hence heat output
It is also an important growth hormone.
© 2016 Paul Billiet ODWS

3. Leptin Secreted by adipose (fat) tissue
It is important in regulating energy balance by suppressing hunger
Obese patients seem to be leptin-resistant.
© 2016 Paul Billiet ODWS

4. Leptin and body mass
© 2016 Paul Billiet ODWS

5. Leptin and body mass index
© 2016 Paul Billiet ODWS

6. Melatonin Produced by the pineal gland
It regulates the circadian rhythm
It has been suggested that it reduces the effects of jet lag
It also seems to be a regulator of growth and development
Recent work suggests it may be important in the immune system.
© 2016 Paul Billiet ODWS