Answer:
Autonomic Nervous System
Explanation:
Autonomic Nervous System comes under the motor division of the peripheral nervous system. The Autonomic nervous system serves to carry the motor information from the central nervous system to the glands and involuntary muscles. It innervates endocrine glands such as adrenal medulla and trigger release of stress hormones under emergency conditions. The sympathetic division of the autonomic nervous system triggers the release of epinephrine and norepinephrine (catecholamines) under stress conditions.
Diffusion is one form of passive transport that doesn't require the expenditure of cellular energy. A molecule can diffuse passively through the cell membrane if it's lipid-soluble, uncharged, and very small, or if a carrier molecule can assist it. ... The assisted process is known as facilitated diffusion.
Got this off google but still hope it helps :)
DNA stands for deoxyribonucleic acid.