Quiz
Neurobiologie
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Fragen in diesem Quiz (18)
1By which mechanism(s) is the unidirectional conduction of nerve fibers guaranteed?
- AWrapping of nerve fibers by an insulating sheath
- BInactivation of voltage-gated sodium channels
- CTemporal summation
- DPresynaptic inhibition
- EDelayed activation of potassium channels
2Which role does cyclic AMP play in heterosynaptic facilitation of the gill withdrawal reflex of Aplysia?
- AcAMP is formed from ATP
- BcAMP activates a G-protein
- CcAMP is not involved
- DcAMP activated proteinkinase A
- EcAMP directly phosphorylates a potassium channel
- FcAMP activates a calcium current
3What is the average conduction velocity of nerve fibers?
- A5-30 meters/second
- B5-30 millimeters/second
- C5-30 meters/hour
4 Which of the neurotransmitter receptors exclusively evoke excitatory PSP´s?
- AGlutamate receptors
- BNMDA-receptors
- Cnicotinic acetylcholine receptors
- DGlycin receptors
- EGABAA-receptors
- FGABAB-receptors
5By which molecular mechanism(s) is an IPSP formed in the case of the GABAA-receptor?
- AActivation of adenylatcyclase
- BOpening of potassium channel
- COpening of chloride channel
- DPostsynaptic calcium current
- EG-protein coupled signaling cascade
6By which molecular mechanism(s) is an IPSP formed in the case of the mAChR of the heart?
- AActivation of adenylatcyclase
- BOpening of potassium channel
- COpening of chloride channel
- DPostsynaptic calcium current
- EG-protein coupled signaling cascade
7Effect of following presynaptic changes on the epsp of corresponding postsynapse: Blocking voltage-gated calcium channels
- Aincreased
- Breduced
- Cno change
8Effect of following presynaptic changes on the epsp of corresponding postsynapse: Reduction of voltage-gated potassium current:
- Aincreased
- Breduced
- Cno change
9Calcium binds to the vesicular protein syntaxin leading to the release of synaptic vesicles from microtubules
- ARichtig
- BFalsch
10Exocytosis of synaptic vesicles is initiated by the opening of voltage- gated calcium channels
- ARichtig
- BFalsch
11The nAChR consists of six subunits each with four transmembrane segments
- ARichtig
- BFalsch
12Voltage-gated potassium channels consist of four subunits each with six transmembrane segments
- ARichtig
- BFalsch
13The voltage-sensor of a sodium channel resides in the second transmembrane segment
- ARichtig
- BFalsch
14During the absolute refractory period action potentials with a reduced amplitude (“size”) can be measured
- ARichtig
- BFalsch
15In the spinal cord myelination of nerve fibers is performed by Schwann cells
- ARichtig
- BFalsch
16The resting membrane potential is exclusively generated by the activity of the Na+-K+ATPase. It can be calculated by the Nernst equation
- ARichtig
- BFalsch
17The signaling strength in a nerve fiber is encoded by the frequency of action potentials
- ARichtig
- BFalsch
18Action potentials follow the all-or-none-law. They are generated by a sodium inward current
- ARichtig
- BFalsch
Informationen
- Beschreibung
- Quiz am Neurobiologie, erstellt von Martha Domhoefer am 05/01/2016.
- Autor
- Martha Domhoefer
- Sprache
- Deutsch
- Aufrufe
- 15
- Bewertung
- Noch keine Bewertungen Bewerte dieses Quiz