Which system is responsible for the absorption of nutrients in the body?

The digestive system is responsible for the absorption of nutrients in the body. It consists of various organs, including the mouth, esophagus, stomach, intestines, and other accessory organs such as the liver and pancreas. The primary function of the digestive system is to break down food into smaller, absorbable components—such as carbohydrates, proteins, and fats—through mechanical and chemical processes.

As food is digested, the small intestine plays a crucial role, where the majority of nutrient absorption occurs. The walls of the small intestine are lined with tiny finger-like projections called villi, which increase the surface area and enable efficient absorption of nutrients into the bloodstream. Once nutrients are absorbed, they are transported to cells throughout the body for energy, growth, and repair.

Other systems mentioned in the question do not have the primary function of nutrient absorption. The nervous system is responsible for transmitting signals throughout the body and regulating bodily functions; the circulatory system transports blood, nutrients, and oxygen to cells but relies on the digestive system for those nutrients; and the excretory system is involved in waste removal from the body, rather than nutrient absorption.