Lesson 2 –Lesson 2 –The Digestive The Digestive

SystemSystem© Brent Coley 2009 | www.mrcoley.com© Brent Coley 2009 | www.mrcoley.com

Digestion: Digestion: breaking down breaking down foodfood into simpler substances into simpler substances thatthat your body can use your body can use

1.1. Your teeth break down Your teeth break down food into smaller pieces.food into smaller pieces.

2.2. SalivaSaliva in your mouth in your mouth helps break down food helps break down food into into nutrients nutrients (food your (food your cells can use).cells can use).

3.3. The process continues in The process continues in other organs. other organs.

4.4. The nutrients pass into The nutrients pass into your blood, and the your blood, and the blood carries them to blood carries them to your cells.your cells.

MouthMouth

EsophagusEsophagus

StomachStomach

Large Large IntestineIntestine

Small Intestine Small Intestine

The The DigestivDigestiv

e e SystemSystem

1.1. Digestion begins in the Digestion begins in the mouthmouth..

2.2. The food then enters theThe food then enters theesophagusesophagus, a long muscular , a long muscular tube that moves food into tube that moves food into thethestomach.stomach.

3.3. Food then enters the Food then enters the stomachstomach..

4.4. The walls of the stomachThe walls of the stomachproduce chemicals that produce chemicals that further break down food.further break down food.

5.5. Muscles in the walls squeezeMuscles in the walls squeeze(contract) over & over, mixing(contract) over & over, mixingfood with the chemicals.food with the chemicals.

6.6. Food becomes a soupy liquid.Food becomes a soupy liquid.

7.7. Food then moves into the Food then moves into the small intestinesmall intestine, a long, , a long, coiledcoiledtube-like organ.tube-like organ.

8.8. Other organs like the Other organs like the pancreas and liver add pancreas and liver add digestive juices to the small digestive juices to the small intestine.intestine.

9.9. This is where nutrients passThis is where nutrients passinto the blood.into the blood.

10.10. Food that is not digested Food that is not digested (waste) moves into the (waste) moves into the large large intestine intestine..

11.11. Solid waste (feces) is Solid waste (feces) is then then pushed out of the body. pushed out of the body.