Problem:
Question 1: Describe intestinal digestion (include chemical and mechanical digestion and the hormones involved)
Question 2: Describe the role of the renal tubules in filtration, reabsorption and secretion.
Question 3: Describe the body's feedback mechanism in response to metabolic acidosis.
Question 4: Explain the homeostatic regulation of the normal concentration of sodium ions in bodily fluids.
Provide a brief explanation for your answer.