Which one of the following statement is false regarding digestion and absorption of food in humans?
(a) Oxyntic cells in our stomach secrete the proenzyme pepsinogen.
(b) Glucose and amino acids are absorbed with the help of carrier ions like Na+.
(c) Chylomicrons are small lipoprotein particles that are transported from intestine into blood capillaries.
(d) About 30% of starch is hydrolysed by salivary amylase in our mouth.
(a) Pepsinogen is secreted into gastric juice from both mucous cells and chief cells. Oxyntic cells secrete hydrochloric acid (HCl) and intrinsic factor.
Massive ions like Na+ facilitate the absorption of substances like amino acids and glucose through co-transport.
Chylomicrons are lipoprotein particles synthesized by intestinal epithelial cells and are transported from intestine into blood capillaries via lacteal.
About 30% of starch digestion happens in the mouth. However, it will vary a bit depending on how long food is chewed, how much moisture there is in the mouth, and how much moisture the starch can absorb.