Catecholamines:
The primary hormones responsible for sweating under fear are catecholamines, which are hormones released by the adrenal glands in response to stress. Catecholamines are a group of hormones that include epinephrine (adrenaline), norepinephrine (noradrenaline), and dopamine. These hormones are released into the bloodstream when a person is in a state of fear or anxiety. They act on the sweat glands to cause sweating, as well as other physiological responses such as increased heart rate, increased blood pressure, and increased breathing rate.
Sympathetic Nervous System:
The release of catecholamines is also stimulated by the sympathetic nervous system. The sympathetic nervous system is responsible for the fight-or-flight response that occurs when a person is in a state of fear or anxiety. This system is activated by signals sent from the brain to the adrenal glands, which then release catecholamines into the bloodstream.
Thermoregulatory Sweating:
In addition to the release of catecholamines, thermoregulatory sweating is also responsible for sweating under fear. This type of sweating is regulated by the hypothalamus, a part of the brain that controls body temperature. When the body is in a state of fear or anxiety, the hypothalamus sends signals to the sweat glands to produce sweat in order to cool down the body and reduce the feeling of fear and anxiety.
Conclusion:
Catecholamines and thermoregulatory sweating are the primary hormones responsible for sweating under fear. Catecholamines are released by the adrenal glands in response to stress, while thermoregulatory sweating is regulated by the hypothalamus. Both of these hormones act on the sweat glands to cause sweating, which helps to reduce the feeling of fear and anxiety.