Which of the body's systems directs and coordinates the interrelated activities of the gastrointestinal tract? which of the body's systems directs and coordinates the interrelated activities of the gastrointestinal tract? the neuromuscular system the lymphatic system the cardiovascular system the skeletal system?

The right option is; The neuromuscular system

The neuromuscular system directs and coordinates the interrelated activities of the gastrointestinal tract.  

The neuromuscular system connects the central nervous system to the peripheral nervous system and it is composed of the nervous system, somatic system, autonomic system and the muscular system which include skeletal, cardiac, and smooth muscles. The neuromuscular system is important in the activities of the gastrointestinal tract, body movements and breathing.

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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.