Download DigestiveSystem5thGeorgina

Digestive System
1st Hour Team Georgina
Include the following on your slide:
Name of organ
Description of structure
Function of organ
Identify if there is mechanical &/or chemical digestion
occuring
Picture of the organ
Identify any secretions produced
Function of secretions
Use only 1 slide. Make sure it is neat & easy to read.
Mouth
Hollow with teeth, a tongue, and lips
Aids in digestion physically and chemically
Teeth mechanically break food down while saliva and
Identify any secretions produced
Function of secretions
Pharynx
behind mouth and nasal cavity, above esophagus
Help push food to esophagus and prevent air from being
swallowed
No mechanical or chemical digestion occurring
No secretions except mucus
Esophagus
● Connects the thoart (pharynx) and the stomach
● Made of muscles that contract to move food to the
stomach
● It is like a highway for food and drink to travel along to
make it to the stomach
● mechanical digestion
● Mucus secretion
Stomach
Ridges of muscle tissue called rugae line it, rounded hollow organ, located inferior
to diaphragm
Pyloric sphinicter is a muscular valve that opens to allow food to pass to the small
intestine
Function: breakdown and digest food to extract nutrients
Both chemical and mechanical digestion! The stomach churns the food and the
food mixes with acids and enzymes
Secretion: pepsin, acid, and gastric juices. The pepsin breaks down proteins.
Some stomach cells produce intrinsic factor a substance needed for the
absorption of Vitamin b 12
Small Intestine
Long and narrow tube; 23 feet long when stretched
90% of digestion and absorption of minerals and nutrients
Chemical digestion -- acids break food down
Digestive enzymes secreted by pancreas and liver
Secretin (hormone) neutralizes potentially harmful acid from stomach
Large intestine
A shorter and wider tube than the small intestine;
approximately 5 feet long and 3 inches in
diameter.
absorption of fluids and the formation of faeces.
Chemical digestion; no digestive enzymes are
produced and the absorption of water and
electrolytes.The elimination of feces is another
function.
There are no secretions in the large intestine. Just
mucus which helps lubricate and form fecal
matter.
Liver
Liver is made up of four lobes
Produces bile
Secretes bile
Bile breaks down large fat globules into smaller ones
Bile is responsible for chemical digestion of fat
No chemical or mechanical digestion actually occurs in the liver
Pancreas
Has two main ducts
Exocrine function helps with digestion and
endocrine function helps regulate blood
sugar
Chemical digestion-produces enzymes that
breakdown all foods
Gallbladder
Small pouch under the liver
Stores bile produced by the liver
Part of chemical digestion
Bile is released into the small intestine to help digest fats
Salivary Glands
There are three types of salivary glands: parotid glands
(Anterior to the ears), submandibular glands(beneath the
lower jaws), and the sublingual glands (beneath the
tongue).
The salivary glands produce saliva which is a mixture of
mucous and serous fluids. In saliva there is an enzyme,
salivary amylase
Chemical digestion takes place because the saliva
produced has salivary amylase that breaks down starch
into glucose.
Saliva also contains substances such as lysozyme and
antibodies that inhibit bacteria
Function: breakdown and digest food to extract nutrients
Both chemical and mechanical digestion! The stomach churns the food and the
food mixes with acids and enzymes
Secretion: pepsin, acid, and gastric juices. The pepsin breaks down proteins.