Physiology

How will this change the membrane potential of the excitable cell?

• disappear completely

• remains unchanged

• slightly decreases

• slightly increase

Which mechanism ensures that the asymmetric concentration of ions on either side of the membrane is maintained at rest?

• the presence of an electromotive force

• constant metabolism of the cell and the presence of an electroactive force

• release of ions during life activity

• sodium-potassium pump

In experiment, the concentration of chlorine ions is increased inside a cell. Explain what will happen to the value of the membrane potential?

• increase to a critical level of depolarization

• decrease to the critical level of depolarization

• increase by an amount proportional to concentration

• decrease by an amount proportional to concentration

What feature of nerves ensures that energy expenditure in the nerve during excitation is insignificant and recovery processes are rapid?

• isolated conduction

• relative fatigability of nerves

• unilateral conduction

• short refractory period

When a tooth was extracted, the patient was anesthetized beforehand. After some time, the patient responded to touching the tooth with weak stimuli and did not respond to strong stimuli.What is this phase of parabiosis called?

• initial

• provisory

• paradoxical

• inhibitory

• ultraparadoxal

Which law is violated in conduction nerve blockade?

• isolated conduction

• unilateral conduction

• physiologic integrity

• bilateral conduction

• force-time

Increase in membrane potential:

• Repolarization

• Hyperpolarization

• Exaltation

• Polarization

• Depolarization

What will happen to the resting potential (RP) if the concentration of potassium ions on either side of the cell membrane is the same?

• decrease slightly

• decrease to zero

• increase significantly

• will not change

• increase insignificantly

Excitable tissue includes:

• bone tissue

• muscle tissue

• connective tissue

• tendons

• cartilage tissue

How excitability changes during the ascending commissure phase

• absolute refractoriness

• secondary relative refractoriness

• significantly increases (exaltation)

• primary relative refractoriness

• slightly increases