Question

 

Explain the human digestive system with a diagram. Describe roles of digestive enzymes in facilitating nutrient breakdown. Apply this knowledge to analyse how enzyme deficiencies (e.g., lactase deficiency) affect digestion and health.

26 Sep 2025
Answer :
Word Count : 542
The human digestive system is a complex network of organs responsible for breaking down food into nutrients that the body can absorb and use for energy, growth, and repair. The digestive process begins in the mouth, where mechanical digestion occurs through chewing, and chemical digestion begins with the action of salivary enzymes such as amylase, which initiates the breakdown of starch into maltose. Food then moves through the esophagus via peristaltic movements to the stomach. The stomach secretes gastric juices containing hydrochloric acid and pepsin, an enzyme that starts protein digestion by breaking proteins into smaller peptides. The acidic environment of the stomach also helps in killing harmful microorganisms, contributing to food safety. From the stomach, partially digested food enters the small intestine, where most nutrient absorption takes place. The pancreas releases pancreatic juice containing enzymes like amylase, lipase, and proteases, which further digest carbohydrates, fats, and proteins, respectively. Bile produced by the liver and stored in
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