Which of the following systems helps to break down food and absorb nutrients?

• A. Gastrointestinal System
• B. Respiratory System
• C. Reproductive System
• D. Musculoskeletal System

Answer: (A)

The gastrointestinal system plays a crucial role in the process of breaking down food and absorbing nutrients. This system includes various organs such as the mouth, esophagus, stomach, intestines, liver, and pancreas, all of which work together to facilitate digestion.

In the mouth, enzymes in saliva begin the breakdown of food, while the stomach continues this process with gastric juices that further digest food into a semi-liquid form. As the food moves into the small intestine, the majority of nutrient absorption occurs, aided by bile from the liver and enzymes from the pancreas. The structure of the intestinal lining, with its villi and microvilli, maximizes the surface area for nutrient absorption into the bloodstream.

In contrast, the other systems mentioned do not have the primary function of digestion and absorption. The respiratory system is responsible for gas exchange, the reproductive system handles the processes of reproduction, and the musculoskeletal system provides structure and support to the body and facilitates movement. Therefore, the gastrointestinal system is the correct answer for its specialized role in handling food, digestion, and nutrient absorption.