1 / 20

Nutrition

Nutrition. A bit about nutrition in general plus the specifics of the human d igestive s ystem. What is Nutrition?. Definition : The process by which organisms get food and break it down to use for their metabolism

moswen
Download Presentation

Nutrition

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Nutrition A bit about nutrition in general plus the specifics of the human digestive system.

  2. What is Nutrition? • Definition:The process by which organisms get food and break it down to use for their metabolism • The nutrients humans need every day are: water, fats, proteins, vitamins, and minerals.

  3. The Human Diet • The average human should ingest about 2,000 Calories/day. This is less than you may think… • Age, gender, lifestyle, weight, and body condition all affect daily Caloric needs.

  4. Organs: The Mouth • Breakdown of food begins in the mouth. • Starches are broken down by an enzyme called salivary amylase.

  5. Organs: The Esophagus • The tube that connects the mouth to the stomach and also begins the process of peristalsis. • Peristalsis: The movement of food down the digestive tract by waves of muscle contractions

  6. Peristalsis This is the esophagus

  7. Organs: The Stomach • A thick-walled muscular sac that contains enzymes and gastric juices (HCl). • The enzyme Pepsin breaks down proteins in the stomach

  8. The Stomach Interesting Fact: It takes approximately 12 hours to completely digest food.

  9. Organs: Small Intestine • Coiled tube about 20 ft. long and 2.5 cm. in diameter. • Most digestion and ALL nutrient absorption is completed here. • Lined with millions of tiny “fingers” called villi which increase surface area and aid in absorption of nutrients.

  10. These are villi

  11. Small Intestinal Enzymes • Amylase, Maltase, Sucrase, Lactase • Continued breakdown of starches • Trypsin, Peptidase • Continued breakdown of proteins • Lipase • Breakdown of fats

  12. Organs: Large Intestine • Tube about 5 ft. long and 6 cm. in diameter…No digestion occurs here! • Functions: • Reabsorption of water • Reabsorption of vitamins (K and B) created by E. coli bacteria! • Elimination of feces through the anus (stored in rectum)

  13. Inside the Large Intestine

  14. Other Important Organs • Liver: Produces bile which breaks down fat in the small intestine • Gall Bladder: Stores bile • Pancreas: Releases enzymes into the small intestine.

  15. Pancreas Liver Gallbladder Small Intestine

  16. Digestive Waste… Feces- the science word for “poop” Defecation- the act of “pooping” Elimination- to get rid of waste from the digestive system (it has never been in your cells, only in your digestive tract). Excretion- to get rid of cellular waste (urine, sweat, exhaled CO2).

  17. The End

More Related