Section 1: Nervous system Flashcards
4 parts of homeostasis and feedback control
Set point Sensor Integrator Effector
Two types of positive feedback cycle
Birth
Neuron stimulus
Function of dendrites
Receive signal from other nedurons
Anterograde transport performed by
Kinesin (from soma to terminal)
Retrograde transport performed by
dynein (from terminal back to soma)
Type of junction in rapid control pathway
Neuron connects directly to target cell, which has surface receptor proteins (Neurotransmitter)
Type of junction in slow control pathways
Neuron secretes into blood or gland to signal distant target cell (neurohormone)
Five types of glia
Oligodendrocytes / Schwann cells Astrocytes Microglia Ependymal cells
Features of glia that differ from neurons
Glia (from Greek for glue) -support cells -not excitable (no action potential) -do not process information
Function of oligodendrocytes
wraps myelin around axon in central nervous system
Function of astrocytes
“maintenance worker of the brain” mops up neurotransmitters and extracellular K
Function of microglia
brain’s immune response
Function of ependymal cells
produce extracellular fluid of the brain (CSF)
Function of Schwann cells
myelination of the peripheral nervous system
Purpose of cholesterol in membrane
controls fluidity
Molecules that can freely pass through membrane
Lipid soluble molecules gas
formula for osmotic pressure
P = RT[solute]
where: P is osmotic pressure R is universal gas constant (L atm / mol K) T is temperature in K
Glucose transported into cell by what method ?
Passive transport (facilitated diffusion)
Na / K pump is an example of what type of transport ?
Primary active transport
examples of secondary active transport
Na + choline Na + glutamate Na / Ca
Tetrodotoxin
Derived from pufferfish blocks Na+ channels
Procaine
Blocks Na channels used as local anesthetic (dentist)
Curare
Blocks actylcholine
Ketamine
Used as vet anesthetic glutamate antagonist
