Digestive and Urinary Systems

Digestive System We are going to talk about the digestive system first! Glue the digestive system diagram to the next blank page in your notebook.

Here’s a piece of candy! Don’t eat it yet! Hungry? Here’s a piece of candy! Don’t eat it yet!

Where does it go? What do you think will happen to this piece of candy in the digestive track?

The digestive system… breaks down food!

The digestive tract includes the: Mouth Esophagus Stomach Small intestine Large intestine

Helping Organs Teeth Salivary glands Tongue Liver Gallbladder Pancreas

Mmmmm…. The digestive process begins before food even enters the mouth. As you were looking at these pictures, the production of saliva may have been triggered in your mouth. Hungry yet?

There are 2 types of digestion: mechanical – food is physically broken down into smaller pieces chemical - food is chemically broken down by different types of enzymes

Human Digestion Activity You will receive a bag with a piece of bread. Do no open yet! You will work in partners.

Human Digestion Activity This demonstration will show you how your STOMACH works to break apart the bonds holding the bread together through chemical and mechanical digestion so that the nutrients can be absorbed, how your LARGE INTESTINE recovers water and vitamins from the food, and how your RECTUM stores the waste temporarily before it exits the body.

Human Digestion Activity Open your bag now so we can pour juice in it. Once you have juice, close your bag tightly and wait for instructions.

Human Digestion Activity Now, with the bag tightly closed, squish the bread with your fingers until all of the pieces are really small.

Human Digestion Activity What does the squishing represent?

Human Digestion Activity mechanical digestion in the stomach

Human Digestion Activity What does the juice represent?

Human Digestion Activity chemical digestion in the stomach HCl Acid

Human Digestion Activity Drain the liquid contents down the sink by creating a small gap which prevents the solids from escaping and compare it with an undrained sample. (poke a hole with your pencil) (Teacher will have the undrained sample)

Human Digestion Activity What stage of digestion does this represent?

Human Digestion Activity water and vitamins are reabsorbed by the large Intestine

Human Digestion Activity Put all of the contents of the bag into the garbage.  What does this represent?

Human Digestion Activity waste is temporarily stored in the rectum

FLOW MAP (10 mins) Using what you have learned and your digestive system diagram, create a flow map of the process of digestion in your science notebook.

So…. The digestive system breaks down food, gives it to the cardiovascular system, which takes it to all body cells. The cells then use the food (combined with oxygen) to make ENERGY!

Urinary System produces, stores, and eliminates fluid wastes removes wastes from your blood

Kidneys When you think urinary system, think kidneys! Kidneys have special filters called nephrons that filter the blood.

Urinary System Multi-Flow Using page 215, create 3 cause-and-effect flow maps. You will do one for each urinary system problem: bacterial infections, kidney stones, and kidney disease. http://www.lifestreamcenter.net/DrB/Lessons/process_maps/cause_effect.gif