Practice Pakistan 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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Carbohydrates are broken down mainly into glucose.
Cells use glucose to produce ATP.
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Proteins supply amino acids for building and repairing tissues.
They also form enzymes, antibodies, and many hormones.
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Fat provides about nine kilocalories per gram.
Carbohydrates and proteins provide about four each.
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Vitamin A supports retinal pigments and epithelial health.
Deficiency can cause night blindness.
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Vitamin D promotes calcium and phosphate absorption.
It is important for healthy bones and teeth.
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Vitamin K is required to make several clotting factors.
Deficiency can increase bleeding risk.
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Calcium combines with phosphate in mineralized tissues.
It also supports muscle and nerve function.
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The cerebellum fine-tunes movements and posture.
Damage can cause poor coordination.
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The medulla regulates vital involuntary functions.
These include breathing rhythm and heart rate.
