Flashcards in Physiology Part 1 Deck (33)
Ascending phase, influx of sodium
Descending phase, efflux of potassium
resting state (membrane polarized)
permeable to sodium ions
Rapid diffusion of potassium to the exterior
Two gates of voltage gated sodium channel
activation and inactivation gates
T/F: Inactivation gate will not re-open until membrane potential is at or nearly at "resting membrane potential" level.
Term for most synapses (axon to dendrite)
Tunnels which connect cytosol of two cells for synaptic transmission
Gap junctions (connexons)
Do chemical synapses touch?
no, very close though
What is myelin made of?
What are the 3 excitatory neurotransmitters?
(eNGiNes excite me)
What are the inhibitory neurotransmitters?
Glycine, GABA, Serotonin, AcH, Dopamine
What do MS, PLS, and ALS all have in common?
Which has more presynaptic bulbs, spatial or temporal summation?
spatial (takes up more space)
temporal summation only has 1
areas of greatest number of pain nociceptors
tip of tongue, lips, genitals, finger tips
encapsulated mechanoreceptors assessing pressure
end bulbs of KRAUSE
perception of temp and pressure
corpuscles of RUFFINI
Iggo Dome Receptors,
anterior spinothalamic tract,
encapsulated fine touch receptors on non-hairy skin
Receptors that are not encapsulated
muscle spindels, Golgi Tendon Organs, and Golgi Tendon Reflex
Prevents excessive tension in a muscle
Golgi Tendon Reflex
Which has cholinergic receptors, sympathetic or parasym?
parasym (sym has adrenergic)
no action potential possible
action potential available with increase potential
many synapses in a single cell