Lab 9 past Qs

Question 1

what is chronaxie?

Answer 1

(Min. duration necessary to elicit an AP if the stimulus strenght twise rheobase)

Question 2

What factor determines if we have a monophasic or biphasic CAP?

Answer 2

(Distance between electrodes)

Question 3

Define local response

Answer 3

(Decrasing magnitude of potential change due to physical processes)

Question 4

What is resting membrane potential

Answer 4

(difference between intra and extracellular space potential)

Question 5

Name of fibres leading impulse from organ to spinal chord?

Answer 5

(Neuron fibres type Ia and type II)

Question 6

Explain exteroceptive reflex?

Answer 6

(receptors outside muscle pick up signal, and trough an arch, it reach an muscle)

Question 7

Explain all- or none-law concerning the action potential?

Answer 7

(must have certain polarization to get reaction, either or not)

Question 8

Explain repolarization

Answer 8

(Positive charges decrease inside the cell)

Question 9

Define treshold?

Answer 9

(a certain level)

Question 10

Main component of reflex arch?

Answer 10

(receptor, afferent nerve, synapse, efferent nevre and the target organ)

Question 11

How to check an normal reaction of Achilles reflex?

Answer 11

(hit just above the insertion of achilles tendon on an freehanging leg)

Question 12

In which phase do you have absolute refractory period?

Answer 12

(Periode before repolarization where the CAP will disapear)

Question 13

What is proprioceptive?

Answer 13

(receptors in the organ)

Question 14

4 stages of action potential.

Answer 14

(depolarization, overshoot, repolarization and post-hyperpolarization)

Question 15

Frequency coding?

Answer 15

(Stronger stimulus, more frequent action potential)

Question 16

Describe CAP?

Answer 16

(Compound action potentials, a summation of different fibers that make up a nerve)

Question 17

Receptors in intrafusal muscle

Answer 17

(nuclear chain receptors and bag receptors)

Question 18

Describe the normal reaction of ankle jerk reflex?

Answer 18

(streching the ankle, plantar flexion)

Question 19

Where do you tap to get the knee jerk reflex?

Answer 19

(patellar ligament)

Question 20

Which channel opens during repolarization?

Answer 20

(Potassium)

Question 21

What is rheobase?

Answer 21

(Minimal stimulus intensity that just generates an AP after long time application)

Question 22

Give the most characteristic features of non-myelinated impulse transmission?

Answer 22

(AP propagates step by step, a channel activates immediately adjacent one)

Question 23

knee jerk reflex

Answer 23

leg extends

Question 24

ankle jerk reflex

Answer 24

stretching the ankle, plantar flexion

Question 25

reiceps reflex

Answer 25

streching the elbow

Question 26

biceps reflex

Answer 26

flexing the elbow

Question 27

panniculus reflex

Answer 27

contraction of skin muscles

Question 28

flexor reflex and crossed extensor reflex

Answer 28

bending of fingers and the leg, extension on the contralateral side

Question 29

corneal reflex

Answer 29

blink the eye

Question 30

menace reflex

Answer 30

blink the eye, move head away

Question 31

direct pupillary light reflex

Answer 31

contraction of the ipsilateral pupil

Question 32

consensual (indirect) pupillary light reflex

Answer 32

contraction of the contralateral pupil

Question 33

auditary reflex

Answer 33

move head and eyes away