Biology ch 44
Terms
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- 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