4th grade-ch. 5 lesson 3 what are the digestive and nervous systems

Ch. 5 Lesson 3Ch. 5 Lesson 3What are the digestive & What are the digestive &

nervous systems?nervous systems?

digestion• Process that breaks food

into forms that your cells can use

YouTube video-Bill Nye digestion song

Where does digestion begin?

Path of digestion

1. mouth- chew food using teeth

•Saliva in mouth begins chemical break down of food

2. ESOPHAGUS

• Muscular tube that connects mouth stomach

• Smooth muscles contract & move food down

3. STOMACH•smooth muscles mash food

•mix w/ juices & form thick liquid

4. SMALL INTESTINE• most digestion occurs here

Journey to the Small Intestine

5. LARGE INTESTINE

•removes water & stores solid waste

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mouth•Digestion begins in your _________.

esophagus

•The food you swallow enters a tube called the ______________________.

Smooth•__________ muscles in the walls of the esophagus contract and move food toward your stomach.

mash

•Smooth muscles in the walls of the stomach _______ the food.

small intestine

•Most digestion takes place in the ______________

liquid

•The large intestine removes much of the ______ and stores the solid waste until it leaves the body.

central nervous system

•control center of body

•brain & spinal cord

neuron•nerve cell

reflex

• quick, automatic response