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The endocrine system is a control system of the human body in which produces chemical messages in the form of hormones. This system is made up of specialised endocrine glands that secrete hormones into the bloodstream (ptdirect[online], 2010).

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testosterone is the male sex hormone involved in the development of muscle tissue and muscular strength, it increases the number of neurotransmitters which encourage muscle growth. It also increases levels of human growth hormone. The hypothalamus and pituitary gland control testosterone levels. Once produced, the hormone moves through the blood to carry out its various important functions.

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Adrenaline is a hormone secreted by the adrenal glands that increases rates of blood circulation, breathing, and carbohydrate metabolism and prepares muscles for exertion. Adrenaline makes your heart beat faster and your lungs breathe more efficiently. It causes the blood vessels to send more blood to the brain and muscles, increases your blood pressure, makes your brain more alert, and raises sugar levels in the blood to give you energy.

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The human growth hormone also known as the somatotropin is a peptide hormone that stimulates growth, cell reproduction, bone growth, and cell regeneration in humans and other animals. For example if a person wants to increase muscle mass it is important that they undertake the correct type of training to release more growth hormone.  This will help them repair and grow more muscle after the training session (ptdirect [online], 2010).
The production of the human growth hormone are increased by sleep, stress, exercise and low glucose levels in the blood. They also increase around the time of puberty.
The hormone is secreted by the the anterior pituitary gland.

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Cortisol works with parts of the brain to control mood motivation and fear.
Cortisol is released by the adrenal glands which is then regulated by the Master Gland (Pituitary Gland). When you wake up, exercise or you're facing a stressful event, your pituitary gland reacts. It sends a signal to the adrenal glands to produce just the right quantity of cortisol.
Once it is produced it increases sugars (glucose) in the bloodstream, enhances your brain's use of glucose and increases the availability of substances that repair tissues (Nicolson, 2008).
The liver, muscle, adipose tissue, and pancreas. In the liver, high cortisol levels increase gluconeogenesis and decrease glycogen synthesis.