digestion breakdown of food into a form that cells can use
TRANSCRIPT
DIGESTION
Breakdown of food into a form that cells can use
DIGESTIVE SYSTEM
PARTS OF THE DIGESTIVE SYSTEM
Mouth Esophagus Stomach Small intestine Large intestine anus
FUNCTIONS THE MOUTH
Grinds food Begins the
physical change of food
Begins the digestion of carbohydrates, by mixing the food with saliva
THE ESOPHOGUS
Takes ground food to the stomach
As it proceeds through it again is mixed with saliva where there is a physical change occurring
THE STOMACH
Food arrives in the stomach mixed and continues to be mixed
The stomach also secretes hydrochloric acid, also known as pepsin
Digestion of proteins takes place in the stomach
THE SMALL INTESTINE
The small intestine is about 30 feet long in humans
The small intestine gets secretions from the liver and gall bladder which digest fat
The pancreas secretions aid in the breakdown of protein fat and carbohydrates
CHEMICAL CHANGES
A chemical change is the breakdown of food into a usable substance that the cells can use.
Enzymes cause this breakdown to occur
This change occurs when the food travels through the digestive system
ENZYMES
Enzymes change the chemical composition of food
These enzymes are produced in the following organs
Water, vitamins and minerals move directly into the cells for use
These do not have to be digested
ORGANS THAT PRODUCE ENZYMES
Mouth produces saliva speeds the digestion of carbohydrates
Stomach produces two chemicals one is an enzyme and one is hydrochloric acid
Small intestine most chemical digestion takes place here
MORE PRODUCERS OF ENZYMES
Pancreas produces enzymes that breakdown fats, protein, and carbohydrates
Liver largest organ in body produces bile
The bile is stored in the gallbladder
Bile breaks down fat
SMALL INTESTINE
Makes certain enzymes also
2.5 cm wide Food spends 12
hours in the small intestine
LARGE INTESTINE
Tube-like organ at the end of the digestive system
5 cm wide Removes water Not much digestion
takes place Water is returned to
the bloodstream Food spends 5 hours
in the large intestine
DIGESTIVE SYSTEM RECAP
Mouth digests carbohydrates
Esophagus pushes food to stomach, takes less than one minute
Stomach, food mixed with hydrochloric acid and pepsin ,digests protein there for about 4 hours
Small intestine gets enzymes from the pancreas, liver and gall bladder for the digestion of proteins, fats and carbohydrates
Food spends about 12 hours here
Large intestine where water gets reabsorbed into the cells
Food spends about 5 hours here
Anus the end of the digestive system, solid waste leaves the body
AFTER THOUGHTS
The digestive system forms a tube that is about
900cm long
The average height of a adult is about 170cm
Your digestive system is about 5 times longer than you’re your body.
Your Assignment
Choose 2 digestive system problems (to be handed out)
Describe the physiology of the condition Prepare statistics and demographics of the
disorder Research preventative dietary treatments Prepare a 3-5 paragraph report which will
be presented to the class Report will be graded based on the rubric
included