Lab 8 - Nervous system Flashcards Preview

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Flashcards in Lab 8 - Nervous system Deck (23)
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1
Q

What is chronaxie?

A

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

2
Q

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

A

Distance between electrodes

3
Q

Define local response

A

Decreasing magnitude of potential change due to physical processes

4
Q

What is resting membrane potential

A

Difference between intra and extracellular space potential

5
Q

Name of fibres leading impulse from organ to spinal chord?

A

Neuron fibres type Ia and type II

6
Q

Explain exteroceptive reflex?

A

Receptors outside muscle pick up signal, and trough an arch, it reach an muscle

7
Q

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

A

Must have certain polarization to get reaction, either or not

8
Q

Explain repolarization

A

Positive charges decrease inside the cell

9
Q

Define treshold?

A

When the depolarization reaches a certain level

10
Q

Main component of reflex arch?

A

Receptor, afferent nerve, synapse, efferent nevre and the target organ

11
Q

How to check an normal reaction of Achilles reflex?

A

Hit just above the insertion of achilles tendon on an freehanging leg

12
Q

In which phase do you have absolute refractory period?

A

Period before repolarization where the CAP will disappear

13
Q

What is proprioceptive?

A

Receptors in the organ

14
Q

4 stages of action potential.

A

Depolarisation, overshoot, repolarization and post-hyperpolarization

15
Q

Frequency coding?

A

Stronger stimulus, more frequent action potential

16
Q

Describe CAP?

A

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

17
Q

Receptors in intrafusal muscle

A

Nuclear chain receptors and bag receptors

18
Q

In which phase of action potential is the total refractory period?

A

Supernormal phase

19
Q

Describe the normal reaction of ankle jerk reflex?

A

Streching the ankle, plantar flexion

20
Q

Where do you tap to get the knee jerk reflex?

A

Patellar ligament

21
Q

Which channel opens during re-polarization?

A

Potassium

22
Q

What is rheobase?

A

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

23
Q

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

A

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