MCQs

موضوع: MCQs الخميس نوفمبر 01, 2007 12:52 pm

1- the brain stem involve:

a- Medulla oblongata, pons & cerebellum

b- Medulla oblongata, pons & midbrain

c- Medulla oblongata, pons & diencephalons

d- Medulla oblongata, pons & cerebrum

e- Forbrain, midbrain & hindbrain

2- regarding Excitatory post synaptic potential (EPSP) all statements are true EXEPT:

a- it is not action potential

b- it is graded or local response

c- cannot be summated

d- it is due to increase influx of Na+ at postsynaptic membrane

e- if it large enough to reach firing level it can produce AP

3- regarding DIRECT inhibition:

a- called pre-synaptic inhibition

b- GABA is an example of it

c- glycine is the neurotransmitter

d- the inhibition is produced due to Cl efflux

e- inhibition of antagonist

4- which one is NOT correctly paired:

a- Glutamate & AMPA receptor

b- Lateral inhibition & discrimination

c- One way conduction & number of vesicles

d- +ve inside cell & inhibition

e- Repetitive impulse & AP

5-The temporal lobe:

a- it lies posterior to the longitudinal sulcus

b- it lies below the lateral sulcus

c- it lies behind the central sulcus

d- it contains the vision center

e- it is part of the corpus collusum

6-The Excitatory postsynaptic potential (EPSP):

a- it is propagated through the nerve fiber

b- a single (EPSP) in one neuron can produce an AP

c- is produced by K efflux

d- it is a local response on the cell membrane

e- cannot be summated

7-Acetylcholine:

a- works through a & b receptor

b- is made of choline & acetate

c- mediate pain in spinal cord

d- its precursor is phenylalanine

e- is degraded by anticholine esterase

8-which of the following is not a part of brain stem?

a- midbrain

b- thalamus

c- pons

d- medulla

9-which of the following determines the nature of synaptic transmission?

a- neurotransmitter

b- G-protein

c- Receptor

d- Medulla

10-The fast EPSP that is produced in a synapse:

a- is usually in the form of depolarization of pre-synaptic neuron

b- is due to the change in the membrane potential towards the equilibrium potential for chloride

c- has fast conduction

d- increases excitability of the nerve cell by quickly reaching the firing level

11-The peripheral nervous system is made up of:

a. Afferent & efferent.

b. Renshaw cell & glnia.

c. Cranial & spinal nerve. _

d. Brain & spinal cord.

e. Interneuron.

12- Inhibitory of postsynaptic neuron Depend on:

a. The number of neurotransmitter presence in presynaptic neuron.

b. Ca++ channel open in postsynaptic membrane.

c. Presynaptic neuron release neurotransmitters that open the

chloride ion cannel at postsynaptic membrane. _

d. Glutamate.

e. An inhibitory neuron synapse directly with the terminals of an inhibitory neuron.

13-synaptic delay depend on:

a- number of receptor

b- increase number of receptor

c- less convergence of neurons

d- number of synapses

e- maximum time for transmission across presynaptic neuron

موضوع: رد: MCQs السبت نوفمبر 03, 2007 3:09 pm

the third and fourth questions are not clear enough

.....
thaaaaank u -tears of happy-
Razz

موضوع: رد: MCQs السبت نوفمبر 03, 2007 4:39 pm

till this moment..
I understood the 4th Q..

Iinhibition=
cl influx-which has negative charge
or:
k outflux- increase the negative charge inside the cells in comparison with out of this cell

so..
inside +ve is not assosciated with inhibition..

موضوع: رد: MCQs الأحد نوفمبر 04, 2007 5:47 am

بالنسبه لرقم 3 كل الخيارات خطأ ماعدا neurotransmetter

مو مكتوب عندنا في المذكرة بس الباقي كلها خطأ

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