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Transmembrane: - ✔✔spanning the lipid bilayer.
G protein: - ✔✔a protein that binds to the guanine nucleotides GTP and GDP.
Second messenger: - ✔✔molecule inside cells that acts to transmit signal from a receptor to a target.
Binding affinity: - ✔✔the tightness of the binding between a receptor and the signaling molecule.
Dimerization: - ✔✔any chemical reaction in which two monomers react to form a dimer.
Phosphorylation: - ✔✔the addition of a phosphate group to a molecule.
Nervous system: - ✔✔a network of many interconnected nerve cells.
Neuron: nerve cell; - ✔✔the basic fundamental unit of nervous systems.
Sensory neuron: - ✔✔a neuron that receives and transmits information about an animal's environment
or its internal physiological state.
Interneuron: - ✔✔a neuron that processes information received by sensory neurons and transmits it to
motor neurons in different body regions.
, Motor neuron: - ✔✔a neuron that, on receiving information from interneurons, effects a response in
the body.
Ganglia: - ✔✔a group of nerve cell bodies that processes sensory information received from a local,
nearby region, resulting in a signal to motor neurons that control some physiological function of the
animal.
Brain: - ✔✔the centralized concentration of neurons in an organ that processes complex sensory stimuli
form the environment or from anywhere in the body.
Nerve: - ✔✔a bundle of long fiberlike extensions from multiple nerve cells.
Centralization: - ✔✔the clustering of nerve cells into a central location that allow for the ability to
peform more complex, coordinated behaviors.
Cephalization: - ✔✔the concentration of nervous system components at one end of the body.
Dendrite: - ✔✔a fiberlike extension from the cell body of a neuron that receives signals from other
nerve cells or from specialized sensory endings; the input end of a nerve cell.
Axon: - ✔✔the fiberlike extension from the cell body of a neuron that transmits signals away from the
nerve's cell body; the output end of a nerve cell.
Axon hillock: - ✔✔the junction of the nerve cell body and its axon.
Action potential: - ✔✔a brief electrical signal transmitted from the nerve cell body along one or more
axon branches.
Synapse: - ✔✔a junction through which the axon terminal communicates with a neighboring cell.