Digestive
System
(Part I)
Digestive System
Sometimes called Alimentary Canal – 30 ft long!
 Two divisions:
– Canal – where digestion occurs
– Accessory organs – no digestion occurs
 Teeth
 Tongue
 Salivary glands
 Liver
 Gall bladder
 pancreas

Types of Digestion

Mechanical
– Teeth
– tongue

Chemical – salivary
enzymes break down
proteins, fats and
carbohydrates
Teeth
http://whyfiles.org/shorties/147tooth/images/teeth.jpg
Tongue
http://www.oralcancerfoundation.org/dental/
images/tongue_exam.jpg picture of
underside of tongue
http://www.neurobio.arizona.edu/282/Lectur
es2005/Taste/08_003.jpg shows Tongue
and taste buds
http://www.morphonix.com/software/education/sci
ence/brain/game/specimens/taste_buds.html
Animation of taste to receptor nerve
http://www.morphonix.com/software/education/sci
ence/brain/game/specimens/taste_bud.html
Taste bud animated
Swallowing
http://www.innerbody.com/anim/mouth.html
process of swallowing
 http://www.innerbody.com/image/dige01.html
shows upper palate - hard and soft
 http://www.medicalook.com/systems_images/Es
ophagus.jpg shows esophagus, pierces the
diagragm, is located posterior to the trachea’s Cshaped cartilage rings.
 http://www.admitonline.info/images/admit/cd_rom/1131_trachea0
9.gif shows tracheal ring

Endoscopic View
http://www.youtube.com/watch?v=fff7xunqgtI&
feature=related digestion and uptake of
nutrients, liver and portal circulation (3.50 min)
 http://www.youtube.com/watch?v=tWJoYk_NJt0
endoscopic views (3.50 min)
 http://www.youtube.com/watch?v=sCn5uvvc3W
E&feature=related mentions salivary enzymes,
and lymphatic system (2.25 min)

Types of Foods
Proteins
 Fats
 Carbohydrates

http://www.youtube.com/watch?v=IxNpXO8
gGFM&feature=related Digestion of
proteins, fats and carbs (2.5 min)
Nutrition
Let’s look at sugar in certain foods
 Let’s look at fat content
 Reading labels
 http://kidshealth.org/kid/closet/games/mis
sion_nutrition.html

Layers of the Alimentary Tube
Mucosal layer
 Submucosal layer
 External muscle layer
 Serosa

Small Intestine
http://www.nlm.nih.gov/medlineplus/ency
/images/ency/fullsize/19221.jpg shows
omentum, cecal pouch, appendix
 http://bio.bd.psu.edu/cat/Circulatory_Syst
em/vesels%20of%20small%20intestine.jp
g shows omentum and vascularity
 http://www.becomehealthynow.com/imag
es/organs/digestive/intest_section.gif Villi

Liver
http://images.medicinenet.com/images/Liver.jpg
shows location of liver in relation to ribs
 http://wwwisg.cs.unimagdeburg.de/cv/gallery/VesselVis/portalVein_li
ver.jpg shows portal veins
 http://www.freewebs.com/soaring_sphincter_tra
vel_agency/Liver.jpg shows liver and gall bladder
and ducts
 http://www.stanford.edu/group/virus/hepadna/2
004tansilvis/liver%20cirrhosis.gif liver cirrhosis

Gall bladder
http://www.youtube.com/watch?v=Pr3Md
9XlLvw&feature=related cholecystectomy
 http://www.pims.math.ca/science/2003/in
verse/gall_bladder.jpeg US of GB

Pancreas
Exocrine and endocrine gland.
 Exocrine function is to secrete enzymes:

– Amylase
– Lipase
– Trypsin

Neutralizes gastric juices
Other link

http://www.innerbody.com/image/digeov.
html - shows some body systems,
animations (such as swallowing) etc.