Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
The Digestive & Excretory Systems My Goals I will know the main job & main organs of the digestive system. I will know the main job & the waste products of the excretory system. Think, Pair, Share What organs make up your digestive system? Digestive System • Organs include: 1. Tongue & Teeth (in mouth) 2. Esophagus 3. Stomach 4. Small Intestine (ileum) 5. Large Intestine (colon) 6. Rectum & Anus Functions of the Digestive System 1. Breaks down food into simple substances. 2. Absorbs nutrients. 3. Converts food into energy. What does convert mean? How do nutrients get into my body? 1. Ingestion = Food enters the mouth. Think, Pair, Share 1. How does your mouth break down food for your body? How does your mouth break down food for your body? a) The tongue & teeth mechanically (physically) break food up. b) Saliva chemically digests food. Saliva = Mostly made of water, also contains mucus & enzymes! Think, Pair, Share How does food know to go down my esophagus instead of my trachea? a) When swallowing, the epiglottis (a small flap of tissue) automatically closes over the trachea (windpipe). Esophagus Food travels in this tube from the mouth to the stomach. Point to your esophagus! Think, Pair, Share When you choke, what is happening? What comes after ingestion? 1. Ingestion = Food enters the mouth. 2. Digestion = Process that breaks food down into small pieces. What organ digests your food? Stomach How is food digested? a.) Mechanical digestion = Food is chewed and churned. b.) Chemical digestion = Stomach acid (HCl) breaks down large food molecules into small molecules (nutrients) to be absorbed by cells. Which is not an example of mechanical digestion? a) Teeth chewing food. b) Tongue breaking up food. c) Smooth muscles in stomach churning food. d) Hydrochloric acid breaking down proteins. Think, Pair, Share What is it called when food is taken in your body? Ingestion! What is it called when food is broken down into tiny pieces? Digestion! What happens after food is digested? 1. Ingestion 2. Digestion 3. Absorption = Small food molecules (nutrients) are taken into the body cells. Where do red blood cells grab nutrients to take to each body cell? (Where are nutrients absorbed?) Small Intestine (6 meters long) 1. Absorption of nutrients happens here. 2. Intestinal juice breaks down food. (full of enzymes) How do the tiny nutrients get into the blood stream? • Digested food is absorbed through the villi in the small intestine into a network of blood vessels that carry the nutrients to all body cells in your entire body! Where do nutrients get absorbed into the blood stream? a) b) c) d) Mouth Stomach Small intestine Liver What happens to food that isn’t absorbed? 1. Ingestion 2. Digestion 3. Absorption 4. Elimination = Waste (unabsorbed food) pass out of the body. Large Intestine What happens in the large intestine? a) Undigested food spends 18–24 hours here, and most of the water is absorbed. b) Collects solid waste (dead bacteria, undigested food, & old intestinal cells). What is another name for the large intestine? Large Intestine = Colon Which is not a function of the digestive system? a) Breaking down food into molecules the body can use b) Absorbing food molecules into the blood to deliver to the body c) Changing waste into molecules the body can use d) Eliminating undigested waste from the body Think, Pair, Share What are the 3 function of the digestive system? 1. Breaks down food into simple substances. 2. Absorbs nutrients. 3. Converts food into energy. Excretory System What is the job of the excretory system? 1. Filters and removes waste from the blood. Think, Pair, Share 1. What waste products do you excrete? Carbon Dioxide (Exhaling) Undigested food, bacteria, & old intestine cells (Feces) Waste products in the blood stream (Urine) Water and salts (Sweat) What organ filters your blood? Kidneys Filter blood that has collected wastes from cells. Where is urine stored until the body is ready to eliminate it? 1. Kidneys 2. Ureters 3. Bladder 4. Urethra What organ excretes water & salts when your body gets too hot? Skin Releases perspiration (water and salts) to cool off the body. What organ releases carbon dioxide from the body? Lungs Release carbon dioxide from the body. Which is not a function of the excretory system? 1. Removes wastes from the blood 2. Removes excess water from the blood 3. Removes carbon dioxide from the blood 4. Removes excess salt from the blood My Goals I will know the main job & main organs of the digestive system. I will know the main job & the waste products of the excretory system. Did you meet your goals? 1. What are the 3 main jobs of the digestive system? 2. What are the main organs of the digestive system? 3. What is the job of the excretory system? 4. What are the waste products that your body excretes?