what two body systems are involved with ph balance
Acid–base homeostasis The pH of the extracellular fluid, including the blood plasma, is normally tightly regulated between 7.36 and 7.42, by the chemical buffers, the respiratory system, and the renal system.[6][13][14][15]
Small intestine Food from the stomach is allowed into the duodenum through the pylorus by a muscle called the pyloric sphincter.
Small intestine Absorption of the majority of nutrients takes place in the jejunum, with the following notable exceptions:
Swallowing 5) Closure of the nasopharynx