Pancreatic juice is called complete digestive juice because it digests all half digested food in small intestine.

Pancreatic juice is an essential component of our digestive system, consisting of various enzymes and substances that aid in the digestion of different types of nutrients. It is known as a "complete digestive juice" due to its comprehensive role in breaking down a wide range of food components and facilitating their absorption in the small intestine.

Composition of Pancreatic Juice:
Pancreatic juice is primarily secreted by the pancreas and contains a combination of enzymes, electrolytes, and other substances:

1. Enzymes: Pancreatic juice contains enzymes such as amylase, lipase, and proteases that are responsible for the digestion of carbohydrates, fats, and proteins, respectively. These enzymes break down complex molecules into smaller fragments that can be easily absorbed by the body.

2. Electrolytes: Pancreatic juice also contains electrolytes like bicarbonate ions, which help to neutralize the acidic environment of the stomach. This alkaline secretion helps in maintaining an optimal pH for the functioning of digestive enzymes and protects the delicate tissues of the small intestine.

3. Other Substances: Additionally, pancreatic juice contains water, mucus, and other substances that support the overall digestive process by lubricating the food and aiding its movement through the digestive tract.

Functions of Pancreatic Juice:
Pancreatic juice plays a crucial role in the digestion and absorption of various nutrients. Its functions include:

1. Carbohydrate Digestion: The enzyme amylase present in pancreatic juice breaks down complex carbohydrates into simpler sugars like glucose, which can be easily absorbed by the body.

2. Fat Digestion: Lipase, another enzyme in pancreatic juice, helps in the breakdown of fats into fatty acids and glycerol. This process is essential for the absorption of dietary fats.

3. Protein Digestion: Proteases, including trypsin, chymotrypsin, and carboxypeptidase, present in pancreatic juice, break down proteins into smaller peptides and amino acids. These products of protein digestion can be absorbed and used by the body for various physiological processes.

4. Neutralization of Stomach Acid: The bicarbonate ions present in pancreatic juice help neutralize the acidic chyme (partially digested food) that enters the small intestine from the stomach. This neutralization protects the intestinal lining and creates an optimal pH for the functioning of digestive enzymes.

5. Overall Digestive Support: Pancreatic juice also aids in the overall digestive process by providing lubrication through mucus secretion and supporting the movement of food through the digestive tract.

Conclusion:
In summary, pancreatic juice is rightly called a "complete digestive juice" due to its composition of enzymes, electrolytes, and other substances that collectively enable the digestion and absorption of carbohydrates, fats, and proteins. Its role in neutralizing stomach acid and supporting the overall digestive process makes it an essential component of our digestive system.