In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: Inhibition of NO - synthase induced a reversible hypertension accompanied by depressed Na + - extrusion from cardiac cells as a consequence of deteriorated Na + - binding properties of the ( Na , K ) - ATPase .
### Output Text:
Inhibition of <span class="chemical">NO</span> - synthase induced a reversible hypertension accompanied by depressed <span class="chemical">Na</span> + - extrusion from cardiac cells as a consequence of deteriorated <span class="chemical">Na</span> + - binding properties of the ( <span class="chemical">Na</span> , <span class="chemical">K</span> ) - ATPase . 