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DIGESTIVE SYSTEM - PowerPoint PPT Presentation


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DIGESTIVE SYSTEM. Takes in Food (mouth) Breaks down food Absorbs the broken down food into the blood stream which delivers it to your tissues and organs. Mouth. CHEWING : breaks food into smaller pieces (increases surface area) “Mechanical” digestion SALIVA : slightly basic.

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PowerPoint Slideshow about 'DIGESTIVE SYSTEM' - lawrence-acosta


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Presentation Transcript
slide1

DIGESTIVE SYSTEM

  • Takes in Food (mouth)
  • Breaks down food
  • Absorbs the broken down food into the blood stream which delivers it to your tissues and organs.
slide2

Mouth

  • CHEWING: breaks food into smaller pieces (increases surface area) “Mechanical” digestion
  • SALIVA: slightly basic

Esophagus

  • PERISTALSIS: muscle contraction that moves food through the digestive tract.
  • Moves food from mouth to stomach in 5-8 seconds.
slide3

STRUCTURE:

  • Very muscular. It contracts to mix food, ”mechanical digestion”
  • Lined with millions of glands that secrete HCl (acidic) and Pepsin (enzyme) “chemical digestion”
  • Food stays there for 2-4 hours

Stomach

slide4

Small Intestine

  • Structure:
  • Muscular tube about 6m long
  • “Small” because of its diameter
  • Duodenum (first 25 cm) of small intestine…this is where enzymes from the pancreas and liver are collected.
slide5

Small Intestine (cont.)

  • DIGESTION:
  • Food stays in the small intestine for 3-5 hours.
  • Food is moved along the intestine by Peristalsis while nutrients are absorbed into the blood stream.
  • Pancreas secretes enzymes that break down carbohydrates, proteins, and fats
  • Liver produces bile-breaks fats into small droplets (Bile is stored in the gall bladder)
slide6

Large Intestine

  • Also known as the “Colon”
  • Only contains things that can’t be digested…waste
  • 1.5m long and 6.5cm wide
  • Water is absorbed here
  • Bacteria live in here to further break down matter
slide7

Elimination

  • 18-24 hours in the large intestine before the feces reaches the rectum and leaves the anus.

Total time it takes to digest is 24-33 hours