Identify the chemical that stimulates peripheral nerve endings and carry pain impulses to the cns.

The correct answer is bradykinin.

Bradykinin refers to an inflammatory mediator. It refers to a peptide, which makes the blood vessels to enlarge, and thus, make blood pressure to decline.

The chemical bradykinin is released from mast cells at the time of asthma attacks, from walls of the gut as a gastrointestinal vasodilator, from destructed tissues as a pain signal, and may function as a neurotransmitter. It straightforwardly stimulates afferent neurons through G-protein coupled bradykinin B2 receptors.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.

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