Your need a lot of energy for daily activities. Cells use, which are substances in food, for...

The Human Digestive System

Your need a lot of energy for daily activities.

Cells use , which are substances in food, for energy, growth, maintenance, and repair.

The system breaks down the food you eat into nutrients that can be used as building materials and that can provide

for cells.

What is the digestive system?

is the process of breaking down food into a form that can pass from the digestive system into the bloodstream.

There are two types of digestion: and .

What are the two types of digestion?

Mechanical Digestion Is the , crushing, and of

food. Ex: Chewing is a type of mechanical

digestion. Chewing creates small pieces of food that are easier to swallow and digest than large pieces are.


Chemical Digestion Is the process in which molecules of food

are broken down into molecules so that they can pass into the bloodstream.

An is a chemical that the body uses to break down large molecules into smaller molecules.

Enzymes act like chemical scissors, they “” large molecules into smaller pieces.

*Without mechanical digestion, chemical digestion would take days instead of hours*


In your mouth, teeth grind food mechanical chemical

In the small intestine, most nutrients are broken down by enzymes

mechanical chemical

Decide if these are mechanical/chemical

The The Esophagus

Small Intestine Intestine

What are the parts of the digestive system?

The Mouth Digestion begins in the with both

mechanical and chemical digestion. Teeth, with the help of the jaw,

and crush food. As you chew, food is moistened by . Saliva contains many ,

including an enzyme that begins the chemical digestion of starches in food.


The Esophagus Once food has been chewed, it is

and moves through the and a long tube called the esophagus.

of muscle contractions move food into the stomach.

Ex: muscle moves food along the same way you move toothpaste from the

bottom of the tube with your thumbs


Stomach The stomach is a

bag that crushes food and contains acids and enzymes for killing and breaking down protein.

The stomach wall contains of muscle so the

stomach can and mix food.

This is the step of mechanical digestion.

Food sits in the stomach for a few hours before moving to…..


Small Intestine The small intestine is a muscular tube were

most digestion takes place. Most nutrients are in the small

intestine as well. Food travels from the stomach into the

small intestine in the form of . is food reduced to a soupy

mixture


Large Intestine After food moves

through the small intestine, it moves to the

intestine. In the large intestine,

and nutrients are absorbed.

Most solid material that remains is .

Waste is and stored until the body eventually eliminates it.


Where are nutrients absorbed?

Small Intestine Large Intestine

After nutrients are down,

they are absorbed into the stream and used by cells

Removes from mostly-digested foods, absorbs vitamins, and turns

waste into semi-solid waste.

-makes fluids that break down every type of material found in foods

Ex: these include proteins, carbohydrates, fats, and nucleic acids -makes and releases a mixture

called that is stored in the gall bladder◦ Bile breaks up large fat droplets into very small

fat droplets

Other organs that help digest nutrients

HOW LONG ARE YOUR INTESTINES? At least feet in an adult. Be glad you're

not a full-grown horse -- their coiled-up intestines are feet long!

Chewing food takes from seconds Swallowing takes about seconds Food sloshing in the stomach can last

hours

Facts about the Digestive System

It takes 3 hours for food to move through the intestine

Food drying up and hanging out in the large intestine can last to !

Americans eat about 700 million pounds of peanut butter.

Americans eat over 2 pounds of chocolate a year.

In your lifetime, your system may handle about 50 tons!!

Facts about the Digestive System

http://www.brainpop.com/health/bodysystems/digestivesystem/

Brainpop



Your need a lot of energy for daily activities. Cells use, which are substances in food, for...

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