3 interactive concept widgets for Digestion and Absorption. Drag any slider, change any number, and watch the formula and the answer update live. Built so you understand how each NEET problem actually works, not just the final number.
On this page
Click any part of the human digestive system to see its role and the NEET fact tested about it.
A labelled diagram of the human digestive system. Click any pin or chip to see the role of that part and the NEET fact tested about it.
Mouth and Buccal Cavity
The entry point of the alimentary canal. Contains teeth (dental formula 2123/2123), tongue and openings of three pairs of salivary glands. Salivary amylase begins starch digestion. Chewing increases surface area. Food is formed into a bolus.
NEET fact
Dental formula is 2123/2123. Human teeth are thecodont, diphyodont and heterodont.
Try this
Pick a food type and trace its digestion through the mouth, stomach and small intestine, with the enzyme and end product at each site.
Pick a food type (carbohydrate, protein, fat or nucleic acid) and trace what enzyme acts at each site, what the substrate is and what the end product becomes.
Pick a food type
Starts as
Starch (polysaccharide)
→
Ends as
Monosaccharides (glucose, fructose, galactose)
→
→
Mouth
Enzyme
Salivary amylase (ptyalin)
Secreted by
Salivary glands
Substrate
Starch
Product
Maltose + dextrins
NEET note
About 30% of starch is digested here. Salivary amylase is inactivated by stomach acid.
Try this
Explore the common digestive disorders and protein energy malnutrition, with cause and key features for each.
Click any disorder or PEM condition to see its cause and key features. Use the filter to focus on digestive disorders or protein energy malnutrition (marasmus and kwashiorkor).
Jaundice
Cause
Excess bilirubin in the blood. Bilirubin is a pigment from the breakdown of haemoglobin in old red blood cells. It is normally processed and excreted by the liver in bile. Jaundice occurs when the liver is diseased (hepatitis, cirrhosis), the bile duct is blocked (obstructive jaundice) or red blood cells are destroyed faster than the liver can clear bilirubin (haemolytic jaundice).
Key features
NEET fact
Jaundice is caused by excess bilirubin in blood. The liver is the main site for bilirubin processing.
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Drag, slide and recompute on the next chapter's widgets.
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