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17 Cards in this Set

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  • Back
Myelin Sheaths
act as insulators in PNS
Acetylcholine
one of the most common neurotransmitters
Three ancestral regions
forebrain, midbrain, hindbrain
Limbic system
much of human emotion depends on this
Blood Brain Barrier
regulates passage of substances into brain/ regulates extracellular chemical environment of CNS
Integration
information from sensory receptors is interpreted and associated with appropriate body response. (ex.Central Nervous System (CNS)- brain and spinal cord)
Nerves
ropelike bundles of neurons which are tightly wrapped in connective tissue and conduct signals
Hyperpolarization
outflow of positive potassium molecules which increases the electrical gradient across the membrane, making the internal fluid more negative
Refractor period
when a neuron is insensitive to depolarization because inactivation gate is still closed from depolarization. This sets a limit on maximum rate at which action potentials can be generated and allows the message to be relayed only in one direction
synaptic vesicles
numerous sacs in hte synaptic terminal which contain neurotransmitters--substances that are released as intercellular messengers into the synaptic cleft
Cephalization
a concentration of feeding organs and sensory structures at the anterior (head) end.
Sensory
(PNS)1. made up of ______ neurons that brings infor to Central Nervous System
Motor
PNS 2. eferent neurons that convey signals from the CNS to effector cells
Somatic Nervous system
motor neurons that carry signals to skeletal muscles mainly in response to external stimuli
Meninges
three protective layers of connective tissue in CNS
Reflex
unconscious, programmed response to a specific stimulus.
Electroencephalogram (EEG)
records different patterns of electrical activity of the brain while sleeping