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bio II sensorySystem

QuestionAnswer
All nervous tissue outside the CNS. Peripheral Nervous System (PNS)
Controls voluntary movements (skeletal muscles). Somatic
Controls involuntary functions (smooth muscle/organs). Autonomic
"Fight or flight" response. Sympathetic
"Rest and rumination" state. Parasympathetic
Astrocytes (CNS) Form the blood-brain barrier and regulate the chemical environment.
Oligodendrocytes (CNS) / Schwann Cells (PNS) Create the myelin sheath.
Microglia: Scavenges dead cells and protect against microorganisms.
Ependymal Cells Line ventricles and produce CSF.
Threshold A voltage change opens voltage-gated Na+ channels
Depolarization Na+ rushes in, making the cell positive.
Repolarization Voltage-gated K+ channels open later to return the potential to rest.
Chemical Synapse Neurotransmitters cross the synaptic cleft to bind to receptors.
Excitatory Makes an action potential more likely.
Inhibitory Makes the membrane more negative (less likely to fire).
Electrical Synapse Gap junctions physically connect cells, allowing current to pass directly
Created by: lily_scav
 

 



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