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DIGESTIVE SYSTEM

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Title: DIGESTIVE SYSTEM


1
DIGESTIVE SYSTEM
2
FUNCTION
  • Process of breaking down food into chemical
    substances that can be used to obtain energy
  • Occurs in the
  • gastrointestinal tract aka digestive tract

3
Where does digestion begin end?
  • A long winding tube beginning at the mouthto the
    anus

4
Structure
  • Mechanical Chemical breakdown of food into
    nutrients
  • Mouth Begin with a bite, mechanical phase mixed
    with saliva chemical phase, forced down pharynx
    swallowing action
  • Esophagus A simple conduit between the mouth and
    stomach - clearly important but only marginally
    interesting compared to other regions of the
    tube.
  • Stomach J shape bag with muscles mechanical
    chemical- enzymatic digestion of proteins
    initiated and food reduced into liquid

5
Structure
  • Liver The center of metabolic activity in the
    body - its major role in the digestive process is
    to provide bile salts to the small intestine,
    which are critical for digestion and absorption
    of fats
  • Gallbladder stores concentrates bile
  • Pancreas Important role provides a mixture of
    digestive enzymes to the small intestine which
    are critical for digestion of fats, carbohydrates
    and protein

6
Structure
  • Small Intestine long coiled tube that performs
    Chemical digestion glands inside release enzymes
    that complete digestion
  • Absorption end product of digestion, lining
    surface where nutrients are transferred into the
    circulatory system

7
Structure
  • Large Intestine (colon) final organ of digestion
    some absorption, solidification of waste move
    material towards rectum finally out the anus

8
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9
What is Halitosis?
  • Bad breath resulting for decomposing food
    particles accumulate in the mouth allowing
    bacteria to flourish

10
What is spit?
  • Mixture of water, mucus and digestive enzyme
    called salivary amylase

11
What is heartburn?
  • Sharp burning pain that occurs when gastric juice
    is regurgitated (reflux) into the esophagus..
    Symptoms similar to heart attack

12
Why do you get diarrhea?
  • Result of contents moving through intestines
    without sufficient time for the water to be absorb

13
Urinary System
14
Function
  • Group of organs that filter, store and eliminates
    waste products
  • Kidneys Lungs Skin all excrete waste

15
What are the main waste products of the body?
  • Carbon dioxide from cellular respiration
    nitrogenous compounds from the breakdown of
    proteins

16
Structure
  • Urine flows from kidneys down tube called ureter
    into the bladder ( muscle storage sac) until
    forced out of the body through a tube called the
    urethra
  • Release of urine is necessary because of toxic
    materials

17
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18
Function
  • Kidneys- Primary excretory organs, two bean shape
    about size of a fist, located behind the stomach
  • Removes toxins, urea, water and mineral salts
    from the blood.
  • Excrete waste in form of urine.

19
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20
Why does urine smell like ammonia?
  • Ammonia is a chemical compound of Nitrogen

21
How much urine must be released every day to
remove the toxic materials maintain homeostasis?
  • AT LEAST 17 oz.

22
How much urine does a normal adult release a day?
  • Between 1.5 L 2.3 L depending on the amount of
    water intake and lost

23
ANY QUESTIONS?
24
HOMEWORK
  • Read 985- 998
  • Study for Final
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