KROK 1 2015 – Question 123 · KROK (Medicine) · Physiology
In the course of an experiment there has been increase in nerve conduction velocity. This may be caused by increase in concentration of the following ions that are present in the solution around the cell:
- A. K+ and Cl−
- B. K+ and Na+
- C. Ca2+
- D. Na+
- E. Ca2+ and Cl−
Hint
Consider what determines the steepness of the action potential upstroke and how changing the ionic gradient across the membrane would speed or slow the spread of excitation.
The answer, the explanation and a note on every option are available once you log in. The account is free: topic tests, a mock exam, mistake review and statistics.
More questions on Physiology
- In an elderly person the change in heart force and vessels physical properties were detected; they can be clearly observed on graphic recording of…
- Electrocardiogram of a young man reveals deviation of his electrical axis of heart to the left. This phenomenon can be caused by:
- Microelectrode analysis of nerve fiber bioelectrical activity revealed, that its membrane potential equals −90 mV. Its initial rest potential was…
- Parkinson’s disease is caused by disruption of dopamine synthesis. What brain structure synthesizes this neurotransmitter?
- Determining a patient’s blood group with monoclonal test-reagents revealed positive agglutination reaction to anti-A and anti-B reagents, and…
- An experiment was aimed at testing flexor reflex in a spinal frog, which was initiated by simultaneous stimulation with isolated pre-threshold…