You should typically give ventilation’s to a young child every 30 seconds.
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The answer to your question is12
Neurotransmitters, such as acetylcholine--the major neurotransmitter found in the human body, act over a short time and they are quickly removed from the synapse by enzymes (i.e. acetylcholinesterase which breaks down acetylcholine to acetyl-CoA and choline).
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I am so sorry I just answered because I need points for my exam