mouth

digestion begins in this structure

tongue

mashes food into a soft ball called a bolus

salivary glands

secrete saliva into the mouth

esophagus

peristalsis occurs here, but no digestion

stomach

muscular organ that contracts and relaxes to churn food like a blender

liver

structure that makes bile

gallbladder

structure that stores bile

pancreas

makes digestive enzymes like insulin and secretes them into the small intestine

teeth

structures that crush and grind food mechanically into smaller bits

small intestine

responsible for most chemical digestion and absorption of nutrients

villi

increase surface area and absorption

large intestine

absorbs water; bacteria here digest fiber and make vitamins B and K

mucus

secreted into the mouth, lines esophagus and stomach

enzymes

proteins that speed chemical reactions and break down nutrients into molecules

bile

breaks down fats into smaller peices so that enzymes can digest the fat

mouth

starches are chemically and mechanically digested here

stomach

proteins are the only nutrient digested here

saliva

contains mucus, enzymes and water; moistens food

fiber

digested by bacteria, which cause gas as a waste product

diffusion

the movement of molecules from an area of higher to concentration to lower

chemical digestion

the breakdown of food into molecules small enough to pass through cell membranes

mechanical digestion

the breakdown of food into smaller particles

chyme

the name of food, now a liquid, as it leaves the stomach and enters the small intestine

absorption

The process by which nutrient molecules pass through the wall of the digestive system into the blood.

epiglottis

The flap of tissue that seals off the windpipe and prevents food from entering.

rectum

A short section at the end of the large intestine where waste material is compressed into a solid form before being eliminated.

feces

solid waste

anus

The opening at the end of the digestive system through which wastes are eliminated.

vomiting

body's response to the internal stimulus of something harmful in the stomach

hydrochloric acid

produced by the stomach, kills bacteria, causes proteins to clump

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording