Describe how carbohydrates are digested in the human alimentary canal.

Explanation

a. Digestion in the mouth`:` The salivary amylase or ptyalin converts starch and glycogen into maltose units.
Starch the Glycogen `+` Water `underset("pH 6.8 to 7.2")overset("Salivary amylase")(rarr)` Maltose units
b. Digestion in intestine `:`
Pancreactic juice `:` Carbohydrase secreted by pancreas is called pancreatic amylase. It converts starch and glycogen into maltose units.
Starch Glycogen `underset("pH 7.1 -8.2")overset("Pancreatic amylase")(rarr)` Maltose units.
Intestinal juice `:` It consists of three types of carbohydrases.
Maltase `:` Maltase catalyses hydrolysis of maltose ( disaccharide ) into glucose units ( monosachharides ) .
Maltose `underset("pH 7.0 to 8.2")overset("Maltase")(rarr)` Glucose `+` Glucose.
Sucrase `:` Sucrase catalyses the splitting of sucrose ( disaccharide ) into glucose, and fructose units ( monosaccharides ) .
Sucrose `underset("(pH 7.1 to 8.2")overset("Sucrase")(rarr)` Glucose `+` Galactose.