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Chapter 4: Q75PP (page 816)

Question: Suppose that the change in Vm was caused by the entry of Ca2+ instead of Na+ . How many Ca2+ ions would have to enter the cell per unit membrane to produce the change?

(a) Half as many as for Na+ ;

(b) The same as for Na+ ;

(c) The twice as many forNa+ ;

(d) Cannot say without knowing the inside and outside concentration of as forCa2+ .

Short Answer

Expert verified

Answer

  1. The half as many as for Na+ .

Step by step solution

01

Definition of ions

The term ions may be defined as a molecule which gains or lose electrons and has a negative or positive electrical charge.

02

Calculation of Ions

The change in the oxidation state on the is one less thanCa2+ so if maintain the equal membrane voltage add half amount of Na+.

Hence, half as many as forNa+ ions would have to enter the cell per unit membrane to produce the change The correct option is (a).

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