Describe what happens to a meal rich in carbohydrates, proteins and lipids (fatty meal of ugali, and eggs) along the alimentary canal from ingestion to egestion.

-The meal is ingested; through the mouth; it is chewed/ masticated by teeth; to break it into smaller particles; mixed with saliva from salivary gland; the enzyme ptyalin/ salivary amylase; converts/ digests starch into maltose; the food is then rolled by the tongue into boluses; and pushed down the oesophagus/ swallowed; the boluses move by peristalsis into the stomach; constant contractions and relaxations of stomach walls mix the food giving rise to chyme; the presence of food in the stomach further stimulates the production/ secretion of gastric juice; which contains Pepsinogen; and Rennin/ Chymosin; Pepsinogen is activated to pepsin; by hydrochloric acid and also provides acidic medium for the action of enzymes; Pepsin breaks down proteins into peptides; Rennin converts/ coagulates the protein (caseinogen) in milk into casein; (which is abundant in young children). It is then pushed to the Duodenum; (through pyloric sphincter). Pancreatic juice in the duodenum contains trypsin; which is secreted in form of Trypsinogen. Trypsinogen is converted into trypsin by enterokinase enzyme; which digests proteins into peptides; lipase; which digests lipids into fatty acids and glycerol; pancreatic amylase; which digests/ breaks down remaining/ undigested starch into maltose; bile emulsifies fats; increasing surface area for the action of enzymes/ lipases; neutralizes acidic medium and provides alkaline medium for the action of pancreatic enzymes; In the ileum; intestinal juice (Succus entericus) is secreted; which contains peptidase enzyme; which breaks down peptides into amino acids; polypeptidase enzyme; which breaks down polypeptides to amino acids; lipase; which converts fats/ lipids into fatty acids and glycerol; sucrase; which digests sucrose into glucose and fructose; maltase which digests maltose into glucose; and lactase; which digests lactose into galactose and glucose; glucose, amino acid, fructose, galactose are absorbed into blood stream; by active transport; and diffusion; fatty acids and glycerol are absorbed into lacteal vessels; the undigested/ indigestible food substances pass through the colon/ large intestines; where water is absorbed; leaving a semi-solid waste materials being passed to the rectum; then out through the anus as faeces;