Name the hormone which stimulates the entire sympathetic nervous system

The sympathetic nervous system (SNS) is a part of the autonomic nervous system (ANS), which also includes the parasympathetic nervous system (PNS).

• The adrenal medulla primarily secretes epinephrine (adrenaline), along with some norepinephrine. The release of these hormones is controlled by the same mechanisms that regulate sympathetic nervous activity.
• During stress or danger, the hypothalamus activates the sympathetic nervous system, which then signals the adrenal glands to release adrenaline. This triggers the well-known “fight or flight” response.
• The effects of adrenaline include:
  • Increased heart rate
  • Faster breathing
  • Profuse sweating
  • Dilation of pupils
  • Increased blood flow to muscles
  • Rise in blood sugar levels

Adrenaline acts both as a hormone and neurotransmitter. It plays a central role in preparing the body to respond quickly to emergencies by activating the sympathetic nervous system.

Correct Answer:Adrenaline stimulates the entire sympathetic nervous system.