Which body system is primarily responsible for digestion and absorption of food?

Which body system is primarily responsible for digestion and absorption of food?

• A. Digestive System
• B. Endocrine System
• C. Nervous System
• D. Respiratory System

Answer: (A)

Digestion and absorption are carried out by the digestive system, which includes the mouth, esophagus, stomach, small and large intestines, and the liver, pancreas, and gallbladder as accessory organs. Digestion uses mechanical actions (like chewing and stomach mixing) and chemical processes (saliva, gastric juice, enzymes) to break food down into smaller molecules. Absorption mainly happens in the small intestine, where nutrients pass through the lining into the bloodstream. The endocrine system does influence digestion by releasing hormones that regulate secretion and motility, but it does not perform the actual breakdown and nutrient uptake. The nervous system coordinates movements and reflexes of the digestive tract, yet it isn’t the main site for digestion and absorption. The respiratory system handles breathing and gas exchange and isn’t involved in processing food. So, the digestive system is the one primarily responsible for digestion and absorption.