MEDICAL
GALLBLADDER AND EXCRETORY SYSTEM OF THE LIVER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the first step in digestion?
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The food is swallowed, and enters the esophagus.
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The salivary glands produce saliva. Enzymes in the saliva begin the chemical breakdown converting the starches to sugar.
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The teeth tear and grind the food into small pieces.
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The epiglottis closes off the trachea to keep food from entering it.
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Explanation:
Detailed explanation-1: -Digestion begins immediately in the oral cavity with both mechanical and chemical digestion. Mechanical digestion in the oral cavity consists of grinding of food into smaller pieces by the teeth, a process called mastication.
Detailed explanation-2: -The mouth: Digestion begins even before we taste food. When we see, smell, taste, or even imagine a tasty meal, our salivary glands (located in front of the ears, under the tongue, and near the lower jaw) begin making saliva (spit). Teeth tear and chop the food. Spit moistens it for easy swallowing.
Detailed explanation-3: -Ingestion. Digestion. Absorption. Assimilation. Egestion.
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