Answer:
Other than holding your breath, what can affect your heart rate? List three variables that can affect heart rate. Activities such as drowning (swimming), racing(athlete), inhalation of Carbon monoxide (CO)
Explanation:
Three variables that can affect heart rate include
Low oxygen intake
Vein blockage (renal artery, renal veins, pulmonary veins)
carbon monoxide (CO) or Hydrogen sulphide inhalation
