Before the following occurred, Brendon seemed a normal, healthy 25 year old man.

Question

Before the following occurred, Brendon seemed a normal, healthy 25 year old man. Brendon started to
have symptoms of weakness and later had difficulty walking. Eventually, an ambulance was called for Brendon
due to his symptom of weakness. He was taken to a hospital emergency department. Blood tests revealed he had
hypokalemia (lower than normal blood potassium ion concentration).
17. During the hypokalemia, were Brendon’s cells closer to or further from threshold compared to a
normal person (or compared to Brendon’s cells before the hypokalemia)?
A. closer to
B. further from
18. Brendon not being able to walk ________be related to the hypokalemia. Hypokalemia ______
decrease “excitability” (the ability to produce electrical signals). Hypokalemia ______ decrease the
ability to produce action potentials.
A. could, can, can
B. could not, can, can
C. could, cannot, cannot
D. could not, cannot, cannot

Explanation / Answer

And. 17 during hypokalemia the Brendon cells become farther from the normal cells

Exp. In hypokalemia the cels become hyperpolarised as the cells become more electronegative

And 18 option a is correct. Brendon could not being able to walk because of hypokalemia. Hypokalemia can decreases excitability. Hypokalemia can decreases the ability to produce action potential

Exp. Because of there in no action potential there is no muscle contraction so Brendon is unable to walk and also there is muscle weakness and paralysis

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