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: The electrolyte balances , weight , bromide space , plasma renin activity , and aldosterone secretion rate were measured .
### Output Text:
The electrolyte balances , weight , bromide space , plasma renin activity , and <span class="chemical">aldosterone</span> secretion rate were measured . 