Warm Up 12 5/5 Happy Cinco de Mayo! Bronchi Bronchioles Nose mouth Larynx Pharynx Trachea Lung Alveoli Diaphragm

THE DIGESTIVE SYSTEM Breaks down food and passes nutrients into your body

Mechanical- physical breakdown of food Chemical- involves enzymes

I. The Mouth 1. Teeth- crush food Saliva moistens food 2. Amylase breaks down starches & release sugar 3. Lysozyme digests cell walls of bacteria

II. Esophagus Food tube to stomach 4. Epiglottis covers trachea to prevent choking 5. Bolus chewed up food 6. Peristalsis – muscular contractions push food down 7. Cardiac sphincter – closes esophagus- prevents back flow

III. Stomach Large muscular sac Continues mechanical digestion (contractions churn & mix food) 8. Mucus lubricates and protects wall 9. Hydrochloric acid- stomach acid 10. Pepsin (enzyme)- digest protein Food becomes 11. chyme- mixture of food and liquid

IV. Small Intestine 12. Chemical digestion and absorption of food 13. Pancreas produces enzymes that break down food, hormones to regulate sugar levels, & chemicals to neutralize stomach acids 14. Liver- produces bile 15. Bile- like detergent to dissolve fat 16. Gallbladder- stores bile

20 ft 17. Villi- fingerlike projections absorb nutrients

V. Large Intestine (5 ft) 18. Removes water from undigested material 19. Concentrated waste remains through the rectum and eliminated out 20. anus

What is the difference between bolus and chyme?

Put the following in order: Stomach, esophagus, mouth, large intestine, rectum, anus, small intestine

Bring a plastic bag tomorrow for our lab.