Practice PPSC questions with answers and explanations.
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The cochlea contains hair cells that respond to sound vibrations.
These signals travel through the auditory nerve.
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Taste buds contain receptor cells for dissolved chemicals.
They contribute to sweet, sour, salty, bitter, and umami sensations.
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A balanced diet supplies energy, building materials, vitamins, minerals, fiber, and water.
Needs vary with age and activity.
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The liver is the largest internal solid organ.
It performs metabolism, detoxification, and bile production.
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Digestion breaks large food molecules into smaller units.
These nutrients can then be absorbed into blood or lymph.
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The small intestine has villi that greatly increase surface area.
Most digested nutrients enter blood or lymph there.
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The large intestine absorbs remaining water and salts.
It compacts undigested material into feces.
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The liver produces bile.
The gallbladder stores and concentrates it.
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Bile breaks large fat globules into small droplets physically.
This increases surface area for lipase action.
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The gallbladder stores and concentrates bile made by the liver.
It releases bile into the small intestine.
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Salivary amylase starts breaking starch into smaller sugars.
Its action continues briefly after swallowing.
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Pepsin works in the acidic stomach environment.
It breaks proteins into smaller peptides.
