Problem: A galvanic cell that uses a salt bridge to complete the electrical circuit.How is electrical balance maintained in the left beaker as Zn2+ ions are formed at the anode?

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We are asked to explain how is an electrical balance maintained in the left beaker as Zn2+ ions are formed at the anode. Given the galvanic cell:

Two beakers are filled with liquid, and are connected by a salt bridge (allows ion migration).  The beaker on the left contains a Zn (solid) electrode (anode, negative) while the beaker on the right contains a Cu (solid) electrode (cathode, positive). The reaction in the left beaker is Zn (solid) goes to Zn2+ (aqueous) plus 2 e-.  The reaction in the right beaker is Cu2+ (aqueous) plus 2 e- goes to Cu (solid).  A voltmeter is connected to both electrodes; electron flow through the voltmeter is from the Zn anode toward the Cu cathode, and registers 1.10 volts.  Through the salt bridge, anions (e.g. NO3-) migrate toward the anode and cations (e.g. Na+) migrate toward the cathode.

In the illustration, we can see that the two metal strips (one is Zn and the other is Cu) are connected by a wire that allows electricity to flow, and the beakers are connected by a salt bridge.

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Problem Details

Two beakers are filled with liquid, and are connected by a salt bridge (allows ion migration).  The beaker on the left contains a Zn (solid) electrode (anode, negative) while the beaker on the right contains a Cu (solid) electrode (cathode, positive). The reaction in the left beaker is Zn (solid) goes to Zn2+ (aqueous) plus 2 e-.  The reaction in the right beaker is Cu2+ (aqueous) plus 2 e- goes to Cu (solid).  A voltmeter is connected to both electrodes; electron flow through the voltmeter is from the Zn anode toward the Cu cathode, and registers 1.10 volts.  Through the salt bridge, anions (e.g. NO3-) migrate toward the anode and cations (e.g. Na+) migrate toward the cathode.
A galvanic cell that uses a salt bridge to complete the electrical circuit.

How is electrical balance maintained in the left beaker as Zn2+ ions are formed at the anode?