Name the chemicals released by sysmpathetic and parasympathetic system

Explanation

### Step-by-Step Solution

1. **Understanding the Nervous System**: The human nervous system is divided into two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The PNS is further divided into the somatic nervous system and the autonomic nervous system, which includes the sympathetic and parasympathetic systems.

2. **Identifying the Sympathetic System**: The sympathetic nervous system is often referred to as the "fight or flight" system. It prepares the body to respond to stressful situations by increasing heart rate, dilating airways, and releasing energy stores.

3. **Chemicals Released by the Sympathetic System**: The primary neurotransmitter released by the sympathetic nervous system is **noradrenaline** (also known as norepinephrine). This chemical is responsible for accelerating the heartbeat and preparing the body for rapid action.

...