The Factors that influence the rate and depth of breathing include voluntary cortical control (Option a).
The expression 'cortical control' makes reference to the functions of the body that are controlled by the cerebral cortex area.
The cortical area is a region of the brain associated with consciousness, feelings and emotions, language, memory, etc.
In conclusion, the Factors that influence the rate and depth of breathing include voluntary cortical control (Option a).
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