The central nervous system is lacking in animals that have
A) a complete gut.
B) bilateral symmetry.
C) radial symmetry.
D) a closed circulatory system.
E) excitable membranes.
Correct Answer:
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Q12: An amino acid neurotransmitter that operates at
Q13: Myelinated neurons are especially abundant in the
A)
Q14: Afferent neuronal systems include the
A) sensory systems.
B)
Q15: Increased activity in the sympathetic nervous system
Q16: In a cephalized invertebrate, the system that
Q18: Choose the correct match of glial cell
Q19: An organism that lacks integration centers
A) cannot
Q20: Preparation for the fight-or-flight response includes activation
Q21: Food and water appetites are under the
Q22: The coordination of groups of skeletal muscles
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