17 MCQs (Only one correct answer)Each MCQ: 1 mark, Total mark: 17 (you will get the results immediately with correction by the web)Allowed time: 20 minGood Luckdr Mohammed Abel Gawad
Local unpropagated
propagated
Occurs in one direction
None of the above
The last point depolarized
The first point stimulated (depolarized)
The myleinated area
None of the above
Local unpropagated impulse
Temporal summation
Propagated action potential
None of the above
RMP
Depolarization
1 & 2
None of the above
There is decrease in RMP
There is increase in excitability
It is propagated potential
Caused by subthreshold stimuli
Can be summated
Utilization time is the fastest response by the strongest strength.
Rheobase strength leads to local excitatory state
The longer the chronaxie the higher the excitability
Minimal time is the fastest response, whatever the strength of the stimulus
Procaine
Hypoxia
Hypocalcemia
Hypokalemia
1. It is in the form of saltatory conduction
2. It saves energy
3. It is local unpropagated
4. It is in the form of continuous conduction
The terminal axon
Cell body
Nodes of ranvier
The internodeal areas
Trans membrane protein showing large number of binding sites on its exterior aspect
Inner ATPase activity is concerned to produce conformational change followed by 2 K+ pumped inside
Ions migrate uphill against both (concentration + electrical) gradient
Binding of (Na – K) to their respective binding sites is followed by activation of the inner ATPase
K outflux
Na influx
Cl outflux
None of the above
K out flux is the major change
Na out flux is the major change
The potential difference between outer and inner surface is Zero
Na-K pump is acting with full capacity
Outer membrane is more negative than inner membrane.
Action potenial is – 50 mv
Potential magnitude is + 35 mv
None of the above
A- Stage of rapid depolarization
B- After depolarization
C- After hyperpolarization
D- All after potential stages
The largest the diameter the fastest velocity conduction
Myleinated (medullated) nerves are faster than non myleinated
The larger the diameter the longer the duration of the spike
The larger the diameter the bigger the magnitude of action potential
Single nerve fiber
Single nerve fiber of mixed nerve
Whole skeletal muscle
Cardiac muscle
1- Delayed Na channel closure
2- Massive inward movement of Cl ions
3- Delayed voltage K channels closure
4- Na-K pump activation
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