Please choose the one BEST response for each.
A. neuroglia
B. detects a stimulus
C. both receives and sends signals from other neurons
D. neurotransmitter molecule
E. controls muscles and glands
F. sodium-potassium pump
G. gray matter
H. voltage difference across a cell membrane
I. voltage difference across a cell membrane that is not receiving stimulation
J. dendrite
K. brief reversal of the voltage difference across a cell membrane
L. a response intensifies the conditions that caused its occurrence
M. neuron membrane potential at which gated sodium channels open
N. electroencephalography
O. positron-emission tomography
A. cells that nurture and support neurons
B. sensory neuron
C. interneuron
D. acetylcholine or GABA
E. motor neuron
F. a type of active transporter
G. fills the butterfly-shaped interior of a spinal cord
H. membrane potential
I. resting membrane potential
J. cytoplasmic extension of neurons that convert chemical signals to electrical signals
K. action potential
L. positive feedback
M. threshold potential
N. provides information about a person's level of wakefulness through voltage fluctuations in the cerebral cortex
O. cluster of cell bodies that serves as simple central nervous system in planarians
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Pikaia gracilens is an extinct invertebrate animal described from the wonderful pre-Cambrian soft-bodied fossils of the Burgess Shale in British Columbia. Examinations by paleontologists have revealed that organisms belonging to this species had a prominent notochord and segmental muscles. From this information, you could conclude that it is closely related to __________.
Fill in the blank(s) with the appropriate word(s).