The sympathetic and parasympathetic nervous systems are two branches of the autonomic nervous system, which controls involuntary bodily functions. The sympathetic nervous system is responsible for the body's "fight or flight" response, activating in times of stress or danger to increase heart rate, dilate airways, and release adrenaline. On the other hand, the parasympathetic nervous system is responsible for the body's "rest and digest" response, promoting relaxation and conservation of energy by slowing heart rate, constricting airways, and stimulating digestion. These two systems work in balance to maintain homeostasis in the body. **

To solve the task "Biology: Autonomic Nervous System - Parasympathetic," you should first understand the basics of the autonomic nervous system, including its two main divisions - the sympathetic and parasympathetic nervous systems. Focus on the functions and effects of the parasympathetic nervous system, such as its role in rest and digest activities. Additionally, familiarize yourself with the neurotransmitters involved in the parasympathetic system, like acetylcholine. Finally, practice applying this knowledge to different scenarios or questions related to the parasympathetic nervous system to solidify your understanding. **

The sympathetic nervous system is responsible for the body's fight-or-flight response, which triggers the release of stress hormones, increases heart rate, dilates airways, and redirects blood flow to muscles. This response prepares the body for intense physical activity. On the other hand, the parasympathetic nervous system is responsible for the body's rest-and-digest response, which promotes relaxation, slows heart rate, constricts airways, and enhances digestion. These two systems work in balance to regulate various bodily functions and maintain homeostasis. **

The sympathetic nervous system is responsible for the body's "fight or flight" response, which prepares the body for stressful or emergency situations by increasing heart rate, dilating pupils, and releasing adrenaline. On the other hand, the parasympathetic nervous system is responsible for the body's "rest and digest" response, which helps the body relax and conserve energy by slowing heart rate, constricting pupils, and promoting digestion. In summary, the sympathetic nervous system activates the body for action, while the parasympathetic nervous system helps the body rest and recover. **

A gas heater uses a spark to ignite the gas and create a flame. Once the gas is ignited, it continues to burn and produce heat without the need for a continuous spark. Therefore, after the initial spark, there is no need for it to remain lit as long as the gas is burning. This is why you may only see a spark when the gas heater is turned on, and not a continuous flame. **

To heat a plate over a candle flame, you can hold the plate above the flame at a safe distance to avoid direct contact with the flame. Move the plate back and forth over the flame to evenly distribute the heat. Be cautious not to hold the plate too close to the flame to prevent it from getting too hot or potentially breaking. **

No, ember is not hotter than fire. Ember is the glowing remains of a fire that has started to die down, whereas fire is the active, burning flames produced by a combustion reaction. Fire typically burns at a higher temperature than ember, as it is actively consuming fuel and releasing heat and light. **

An ember tetra is a small freshwater fish that is popular in the aquarium hobby. It is known for its vibrant red and orange coloration, resembling the glowing embers of a fire, hence its name. Ember tetras are peaceful and social fish that do well in community aquariums with other small, non-aggressive fish. They are relatively easy to care for and are a great choice for beginner fish keepers. **