Study the following statements regarding human digestion and digestive system.
a) Pyloric sphincter allows the passage of chyme.
b) Proteins remain undigested before when the food passes through pyloric sphincter.
c) Unabsorbed and undigested food passes through ileo-caecal valve.
d) All the sphincters are made up of smooth muscles only.
The correct ones of the above are

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a and b

a and c

b and c

c and d

answer is B.

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Detailed Solution

Pyloric sphincter allows the passage of chyme.

Unabsorbed and undigested food passes through ileo-caecal valve.

The proteins are partially digested in the stomach by pepsin. So food passing through pyloric sphincter has partially digested protein (not undigested).

Sphincters can be made of wither smooth or skeletal muscles. For example, internal anal sphincter is made of smooth muscles while the external anal sphincter is made of skeletal muscles.

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