The nervous system works by electrochemical signals in the nerves and
from one nerve to the next. The hormonal system exerts its influences by
chemicals that circulate in the blood. These two systems also affect each
other in coordinating body systems.
NSES Content Standard C
Life Science: Structure and function in living systems Grades 5-8, page 156 The human organism has systems for digestion, respiration, reproduction, circulation, excretion, movement, control and coordination, and for protection from disease. These systems interact with one another. NSES Content Standard C
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