Lab 9 past Qs Flashcards
what is chronaxie?
(Min. duration necessary to elicit an AP if the stimulus strenght twise rheobase)
What factor determines if we have a monophasic or biphasic CAP?
(Distance between electrodes)
Define local response
(Decrasing magnitude of potential change due to physical processes)
What is resting membrane potential
(difference between intra and extracellular space potential)
Name of fibres leading impulse from organ to spinal chord?
(Neuron fibres type Ia and type II)
Explain exteroceptive reflex?
(receptors outside muscle pick up signal, and trough an arch, it reach an muscle)
Explain all- or none-law concerning the action potential?
(must have certain polarization to get reaction, either or not)
Explain repolarization
(Positive charges decrease inside the cell)
Define treshold?
(a certain level)
Main component of reflex arch?
(receptor, afferent nerve, synapse, efferent nevre and the target organ)
How to check an normal reaction of Achilles reflex?
(hit just above the insertion of achilles tendon on an freehanging leg)
In which phase do you have absolute refractory period?
(Periode before repolarization where the CAP will disapear)
What is proprioceptive?
(receptors in the organ)
4 stages of action potential.
(depolarization, overshoot, repolarization and post-hyperpolarization)
Frequency coding?
(Stronger stimulus, more frequent action potential)
Describe CAP?
(Compound action potentials, a summation of different fibers that make up a nerve)
Receptors in intrafusal muscle
(nuclear chain receptors and bag receptors)
Describe the normal reaction of ankle jerk reflex?
(streching the ankle, plantar flexion)
Where do you tap to get the knee jerk reflex?
(patellar ligament)
Which channel opens during repolarization?
(Potassium)
What is rheobase?
(Minimal stimulus intensity that just generates an AP after long time application)
Give the most characteristic features of non-myelinated impulse transmission?
(AP propagates step by step, a channel activates immediately adjacent one)
knee jerk reflex
leg extends
ankle jerk reflex
stretching the ankle, plantar flexion
reiceps reflex
streching the elbow
biceps reflex
flexing the elbow
panniculus reflex
contraction of skin muscles
flexor reflex and crossed extensor reflex
bending of fingers and the leg, extension on the contralateral side
corneal reflex
blink the eye
menace reflex
blink the eye, move head away
direct pupillary light reflex
contraction of the ipsilateral pupil
consensual (indirect) pupillary light reflex
contraction of the contralateral pupil
auditary reflex
move head and eyes away
