Final answer:
Vomiting causes a decrease in blood bicarbonate and pH by causing a loss of hydrochloric acid from the stomach through vomiting.
Step-by-step explanation:
Vomiting causes a decrease in blood bicarbonate and pH by causing a loss of hydrochloric acid from the stomach through vomiting. This loss of acid leads to a decrease in the levels of hydrogen ions (H+) in the blood, resulting in a decrease in bicarbonate levels and a decrease in blood pH.
When someone vomits, the stomach contents are expelled, including stomach acid. Stomach acid is crucial for maintaining the normal acid-base balance in the body. The loss of hydrochloric acid through vomiting disrupts this balance, leading to a decrease in blood bicarbonate and pH.