Write the full forms of the following abbreviations:
$(1)$ $RQ$
$(2)$ $TCA$

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(N/A) $(1)$ $RQ$ stands for Respiratory Quotient. It is defined as the ratio of the volume of $CO_2$ evolved to the volume of $O_2$ consumed during respiration.
$(2)$ $TCA$ stands for Tricarboxylic Acid. It refers to the $TCA$ cycle,also known as the Krebs cycle or Citric Acid cycle,which is a series of chemical reactions used by all aerobic organisms to release stored energy.

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