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Anger is associated with a large array of physiological variables.

• In response to an electrical stimulation to the hypothalamus area of the brain, production of the hormone adrenaline is increased.
• Respiration deepens.
• The heart beats more rapidly and may palpitate. Blood pressure rises.
• The sympathetic nervous system diverts blood from the skin, liver, stomach and intestines to the heart, central nervous system and muscles.
• The digestive processes are suspended.
• Glucose is freed from reserves in the liver.
• Cortisol production is increased in order to depress the immune system.
• The spleen contracts and discharges its content of concentrated corpuscles.
• Men have an increased supply of the hormone testosterone.
• Involvement of amygdala.
• Increase in left prefrontal cortical activation.

More noticeable effects of anger include:

• More acute senses.
• Desire to yell or to move quickly and forcefully.
• The eyes are open wider than usual and the pupils are dilated.
• The face reddens, but then may turn pale.
• Increased physical strength.
• Speech and motion are faster and more intense.
• Tense muscles.
• Bloodlust