Human Alimentary Canal

What is the primary purpose of digestion?

• To convert large insoluble molecules into small soluble molecules.

• To transport food around the body.

• To assimilate nutrients into cells.

• To break down food mechanically only.

Which sequence correctly lists the main organs food passes through in the human digestive system?

• Mouth, oesophagus, stomach, small intestine, large intestine.

• Mouth, stomach, oesophagus, small intestine, large intestine.

• Oesophagus, mouth, stomach, large intestine, small intestine.

• Mouth, small intestine, large intestine, stomach, oesophagus.

What two types of digestion occur in the mouth, and what is the role of the enzyme amylase?

• Mechanical and chemical; amylase breaks down starch into maltose.

• Mechanical and chemical; amylase breaks down protein into amino acids.

• Only mechanical; amylase helps absorb nutrients.

• Only chemical; amylase breaks down fats into fatty acids.

What are the main functions of the stomach during digestion?

• Churning food, killing bacteria with hydrochloric acid, and breaking down protein with pepsin.

• Absorbing nutrients into the bloodstream and producing bile.

• Breaking down starch into maltose and emulsifying lipids.

• Transporting food to the small intestine and storing excess water.

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Which enzyme, found in pancreatic juice, is responsible for breaking down lipids?

• Amylase

• Trypsin

• Lipase

• Pepsin

What is the process called where waves of muscle contraction move food along the gut?

• Absorption

• Digestion

• Peristalsis

• Egestion

What structures in the ileum are primarily responsible for absorbing the products of fat digestion?

• Blood capillaries

• Villi

• Microvilli

• Lacteals

What is the primary function of the colon in the digestive system?

• Breaking down proteins

• Absorbing water

• Emulsifying fats

• Producing enzymes