Anger is one of the basic emotions. It occurs when something threatens our safety - physical or emotional.
Let's arrange all states according to intensity level in order of increasing emotional intensity: Dissatisfaction - irritation - indignation - indignation - anger - hatred - anger - rage.
In essence, rage is a defense against feelings of despair and helplessness.
The manifestation of rage leads to the satisfaction of vital needs (with rage we are always talking about the frustration of vital needs), and the rage weakens and turns into constructive anger.
Physiologically, anger and anger have an exciting effect: the heartbeat quickens, blood vessels dilate, blood rushes to the face and limbs (so that the individual has the opportunity to scare away the enemy with its appearance or fight back), and catecholamine hormones are released (including adrenaline and norepinephrine).
An angry person's blood levels of adrenaline and norepinephrine increase, the heart rate increases (that's why we sometimes turn red when we're angry), and the blood supply to the muscles increases (so we can fight).
You may notice that when you are angry, your whole body tenses up.