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intestine

Primary Information
Secondary Information

Definition

The intestine is a long, muscular tube that is part of the digestive tract. It is where food is broken down and absorbed into the bloodstream.

The intestine is divided into three parts: the small intestine, the large intestine, and the rectum. The small intestine is where most of the digestion happens. The large intestine absorbs water and nutrients from the digested food. The rectum is where waste products are stored before they are eliminated from the body.

The intestine is lined with a layer of cells that secrete mucus. The mucus helps to protect the intestine from the acidic contents of the stomach. The intestine is also home to billions of bacteria. These bacteria help to break down food and produce vitamins.

The intestine is a very important organ. It helps us to get the nutrients we need to stay healthy. It also helps to protect us from disease.

How can the word be used?

The patient had a blockage in his intestines.

intestine

Different forms of the word

Noun: An intestine is a long, muscular tube that is part of the digestive system.

Adjective: Intestinal means relating to the intestines. For example, intestinal gas is gas that is produced in the intestines.

Etymology

The word "intestine" comes from the Latin word "intestinum", which means "entrails" or "bowels". This is a very accurate description of the meaning of the word "intestine", as it refers to the long, muscular tubes that are part of the digestive system.

Question

What do your intestines do?

AQA Science Exam Question and Answer

Question:

Explain the role of the intestine in the digestive system, detailing its structure, functions, and the process of nutrient absorption. Discuss how the small and large intestines work together to break down and absorb food and highlight the importance of this process in providing energy and nutrients to the body.

Answer:

  • The intestine plays a crucial role in the digestive system, responsible for further breaking down food and absorbing essential nutrients. It consists of two main parts: the small intestine and the large intestine.
  • The small intestine is where most digestion and nutrient absorption occur. Its lining is covered with tiny finger-like projections called villi, which increase the surface area for absorption. As partially digested food enters the small intestine from the stomach, enzymes from the pancreas and the small intestine itself break down proteins, carbohydrates, and fats into simpler molecules. These nutrients are then absorbed through the villi and transported into the bloodstream for distribution throughout the body.
  • The large intestine, though mainly involved in water absorption and waste elimination, also has a role in nutrient absorption. Bacteria in the large intestine help break down remaining complex carbohydrates and produce certain vitamins.
  • The process of nutrient absorption in the intestines is essential for providing energy and vital nutrients like vitamins, minerals, and amino acids needed for growth, repair, and overall body function.

In conclusion, the intestine is a key player in the digestive system. Its structural adaptations and enzymatic actions in the small intestine, along with water absorption in the large intestine, enable the efficient breakdown and absorption of nutrients, ensuring the body's energy needs are met and essential substances are delivered to cells and tissues.