The nervous system is responsible for responses such as pupil dilation, increased heart rate, and increased respiration. autonomic parasympathetic somatic sympathetic

The correct answer will be option sympathetic nervous system

Explanation:

Sympathetic nervous system is a type of autonomic nervous system which response in conditions of stress such as threat or injury or fight or flight conditions.

They communicate with the Peripheral nervous system via sympathetic ganglia- pre and post a ganglionic in which pre-ganglionic neurons release acetylcholine in response to stimulus which binds to receptors on post-ganglionic neurons which release adrenaline.  This adrenaline increases the heart rate, respiration, cellular metabolism, pupil dilation.

Thus, the sympathetic nervous system is the correct option.

a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic

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