Digestive System

Digestive system: it is used to breakdown food into nutrients and which then pass into circulatory system and are taken to where they are needed in body.

FUNCTION OF DIGESTIVE SYSTEM

• Ingest (consume) food. (stage1)=Ingestion
• Breakdown food into nutrients.(stage 2)=Digestion
• Absorb nutrients in the bloodstream.(stage 3)=Absorption
• Remove the wastage.(stage 4)=Egestion

Function of saliva in Digestive System

• It moist the food.
• It begins digestion.
• It adjust salt appetite (natural desire to satisfy a bodily need, especially for food).
• The flow of saliva help to wash pathogenic bacteria.

1. ESOPHAGUS: A muscular tube through which food passes from mouth to stomach.

   • As you chew your tongue helps mould your food into a mass called bolus (small rounded mass of substance).
   • When you swallow the bolus it enters esophagus.
   • Opening of esophagus lied next to wind pipe.
   • When u swallow, opening of trachea is closed.

2. STOMACH: after esophagus food goes to stomach where it mixes with acid and enzymes.

   • Acid kills bacteria and viruses & enzymes help down to break down protein and essential nutrients.
   • There is layer of mucus in stomach which protects stomach being eaten by acid.

3. Small intestine: in small intestine liver and pancreas help to maximize digestion.

   • Liver: once nutrients absorbed in blood it pass through liver and glucose absorbed in liver.
   • PANCREAS: it release pancreatic juice, it neutralize the acid to maintain acid balance and help to breakdown protein & starches (chain of glucose).

4. Large intestines: it absorbs water from waste material leftover.

   • All leftover waste compact and stored at end of large intestine called rectum
   • When it gets full, anal sphincter loosen and waste passes out.
   • Basically large intestine drying up the food so body can use the water that was in it.

Worksheet

1. Name the Glands associated with the Human Digestive System?
   • A. Salivary Glands and Pancreas
   • B. Salivary Glands and Liver
   • C. Liver and Pancreas
   • D. Salivary Glands, Liver & Pancreas
   Ans: D
2. Arrange the correct sequence of the steps involved in the process of Human Digestive System?
   • A. Digestion, Ingestion, Assimilation, Egestion and Absorption
   • B. Ingestion, Digestion, Absorption, Assimilation and Egestion
   • C. Egestion, Absorption, Digestion, Assimilation and Ingestion
   Ans: B
3. In which part of the body digestion of protein begins?
   • A. Pancreas
   • B. Pancreas
   • C. Small Intestine
   • D. Large Intestine
   Ans: B
4. Complete digestion of food occurs in:
   • A. Stomach
   • B. Small Intestine
   • C. Pancreas
   • D. Large Intestine
   Ans: B
5. In which part of our body food gets absorbed?
   • A. Small Intestine
   • B. Large Intestine
   • C. Stomach
   • D. Stomach
   Ans: A
6. What is digestive system.
   • A. The body breathing system.
   • B. The body blood transporting system.
   • C. The body food processing system.
   Ans: C
7. Where does food pass through between mouth and stomach?
   • A. Esophagus
   • B. Small intestine
   • C. Large intestine
   Ans: A
8. Where does the partly-digested food goes after stomach.
   • A. Small intestine
   • B. Large intestine
   • C. Large
   Ans: A
9. How does a digested food nutrient finally reach to bloodstream?
   • A. It passes through the esophagus into the blood.
   • B. It is absorbed by blood through blood vessels.
   • C. It is absorbed through blood by walls of stomach.
   Ans: B

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