Name the enzyme present in human saliva and pancreatic juice.

Enzymes in human saliva:

1. Salivary amylase (Ptyalin): The primary enzyme in saliva
   • Function: Breaks down starch (complex carbohydrates) into maltose and simpler sugars
   • Significance: Initiates carbohydrate digestion in the mouth
   • Optimal pH: Works best at neutral pH (around 6.7-7.0)
2. Lingual lipase (minor component): Begins limited fat digestion in the mouth and continues in the stomach

Enzymes in pancreatic juice:

The pancreas secretes multiple digestive enzymes into the small intestine, including:

1. Pancreatic amylase: Continues the breakdown of starches into maltose and other simple sugars
2. Trypsin: Breaks down proteins into smaller peptides (activated from trypsinogen by enterokinase)
3. Chymotrypsin: Another proteolytic enzyme that digests proteins
4. Carboxypeptidase: Cleaves amino acids from protein chains
5. Pancreatic lipase: The main enzyme for fat digestion, breaking triglycerides into fatty acids and glycerol
6. Nucleases (ribonuclease and deoxyribonuclease): Break down nucleic acids (RNA and DNA)

Summary: While saliva contains primarily salivary amylase, pancreatic juice is a comprehensive digestive cocktail containing pancreatic amylase, trypsin, chymotrypsin, lipase, and nucleases, making it essential for the complete digestion of all major nutrients in the small intestine.