Secreted in the adrenal glands, it increases heart rate, breathing rate and metabolic rate - Adrenaline, Acts as a neurotransmitter. Low levels of this are associated with depression - Noradrenaline, Associated with stress. Increase blood sugar levels, suppresses immune system - Cortisol, Primary male sex hormone involved in development of muscle tissue and muscular strength. This increases the number of neurotransmitters, encouraging muscle tissue growth.  - Testosterone, Secreted by the pituitary gland which stimulates general body growth and the lengthening of bones in particular - Human Growth Hormone, Inhibits bone resorption - Oestrogen,

Endocrine System

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