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Human Digestive System

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Presentation on theme: "Human Digestive System"— Presentation transcript:

1 Human Digestive System

2 Functions Ingest food Break down food Move through digestive tract
Absorb digested food and water Eliminates waste materials

3 Mouth Breaks down food into small pieces
Begins starch digestion (amylase) Saliva produces amylase and lubricates food Moves food into esophagus Epiglottis covers trachea Peristalsis moves food to stomach

4 Draw Tooth Structure Here Page 960

5 Stomach First opening – cardiac sphincter
Muscles churn food – more mechanical digestion. Glands produce gastric juice = pepsin + HCl Pepsin breaks down proteins (only at pH 2) Food leaves after 2-4 hrs Second opening – pyloric sphincter

6 Small Intestine Digestion is finished here
Peristalsis finishes mechanical digestion Pancreatic juice produces enzymes to finish chemical digestion of fats, proteins and carbohydrates Question: What are the monomers for fats, proteins, and carbohydrates?

7 Liver Produces bile Question: What is the function of bile?
Bile is stored in the gallbladder.

8 Large Intestine Absorbs water Bacteria live here (produce methane)
Bacteria produce B vitamins and Vitamin K Stores solid waste in rectum until elimination.

9 Endocrine Glands Define endocrine gland here.
Pancreas – insulin = blood sugar Thyroid – thyroxine = metabolic rates Thyroid – calcitonin = blood calcium levels Parathyroid – PTH = calcium, phosphorus absroption rates and helps make Vitamin D

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