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Anatomy and Physiology II Tanveer Tara ,NSUI
Course Instructor
Tanveer Tara
Department of Medical Laboratory Technology
National Skills University, Islamabad, Pakistan
Digestive System
• The food you eat takes an
incredible journey through
your body, from top (your
mouth) to bottom (your
anus).
• Along the way the beneficial
parts of your food are
absorbed, giving you energy
and nutrients
Tanveer Tara ,NSUI
What is the digestive system?
• Digestive system is made up of the
gastrointestinal (GI) tract ,liver,
pancreas and gallbladder.
• The GI tract is a series of hollow
organs that are connected to each
other from your mouth to your
anus.
• The organs that make up your GI
tract, in the order that they are
connected, include your mouth,
esophagus, stomach, small
intestine, large intestine and anus.
Tanveer Tara ,NSUI
Tanveer Tara ,NSUI
What does the digestive system do?
• Your digestive system is
uniquely constructed to do
its job of turning your food
into the nutrients and
energy you need to survive.
• And when it’s done with
that, it handily packages
your solid waste, or stool,
for disposal when you have
a bowel movement.
Tanveer Tara ,NSUI
Tanveer Tara ,NSUI
Tanveer Tara ,NSUI
Function of digestive system
• Ingestion or consumption of food substances
• Breaking them into small particles
• Transport of small particles to different areas of the
• digestive tract
• Secretion of enzymes and other substances for digestion
• Absorption of the digestive products (nutrients)
• Removal of unwanted substances from the body
Tanveer Tara ,NSUI
• Gastrointestinal tract (GI tract) or alimentary
canal and accessory organs
• GI tract is a tubular structure extending from the
mouth up to anus, with a length of about 30 feet.
• GI tract is formed by two types of organs:
• 1. Primary digestive organs.
• 2. Accessory digestive organs
Tanveer Tara ,NSUI
• Digestive system
Important terms
Digestion :
Digestion is the process of turning
complex food particles into
simpler ones that may be
easily absorbed by the
body.
Mastication:
(chewing), in which food is
crushed and mixed with
saliva to form a bolus for
swallowing, is a complex
mechanism involving opening
and closing of the jaw,
secretion of saliva, and
mixing of food with the
tongue.
Tanveer Tara ,NSUI
Enzymes
Allows the nutrients from these
foods to be easily absorbed into
your blood and carried through
your body.
There are several digestive
enzymes, including amylase,
maltase, lactase, lipase, sucrase,
and proteases.
Important terms
Ingestion:
The process of taking food,
drink, or another substance
into the body
by swallowing or absorbing
it.
Tanveer Tara ,NSUI
Defecation
Defecation (or defaecation)
follows digestion, and is
a necessary process by
which organisms
eliminate a solid,
semisolid.

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Lecture 1-Digestive System.pdf ppt presentation

  • 1. Anatomy and Physiology II Tanveer Tara ,NSUI Course Instructor Tanveer Tara Department of Medical Laboratory Technology National Skills University, Islamabad, Pakistan
  • 2. Digestive System • The food you eat takes an incredible journey through your body, from top (your mouth) to bottom (your anus). • Along the way the beneficial parts of your food are absorbed, giving you energy and nutrients Tanveer Tara ,NSUI
  • 3. What is the digestive system? • Digestive system is made up of the gastrointestinal (GI) tract ,liver, pancreas and gallbladder. • The GI tract is a series of hollow organs that are connected to each other from your mouth to your anus. • The organs that make up your GI tract, in the order that they are connected, include your mouth, esophagus, stomach, small intestine, large intestine and anus. Tanveer Tara ,NSUI
  • 5. What does the digestive system do? • Your digestive system is uniquely constructed to do its job of turning your food into the nutrients and energy you need to survive. • And when it’s done with that, it handily packages your solid waste, or stool, for disposal when you have a bowel movement. Tanveer Tara ,NSUI
  • 8. Function of digestive system • Ingestion or consumption of food substances • Breaking them into small particles • Transport of small particles to different areas of the • digestive tract • Secretion of enzymes and other substances for digestion • Absorption of the digestive products (nutrients) • Removal of unwanted substances from the body Tanveer Tara ,NSUI
  • 9. • Gastrointestinal tract (GI tract) or alimentary canal and accessory organs • GI tract is a tubular structure extending from the mouth up to anus, with a length of about 30 feet. • GI tract is formed by two types of organs: • 1. Primary digestive organs. • 2. Accessory digestive organs Tanveer Tara ,NSUI • Digestive system
  • 10. Important terms Digestion : Digestion is the process of turning complex food particles into simpler ones that may be easily absorbed by the body. Mastication: (chewing), in which food is crushed and mixed with saliva to form a bolus for swallowing, is a complex mechanism involving opening and closing of the jaw, secretion of saliva, and mixing of food with the tongue. Tanveer Tara ,NSUI Enzymes Allows the nutrients from these foods to be easily absorbed into your blood and carried through your body. There are several digestive enzymes, including amylase, maltase, lactase, lipase, sucrase, and proteases.
  • 11. Important terms Ingestion: The process of taking food, drink, or another substance into the body by swallowing or absorbing it. Tanveer Tara ,NSUI Defecation Defecation (or defaecation) follows digestion, and is a necessary process by which organisms eliminate a solid, semisolid.