The digestive system

Learning goals We are learning the organs of the digestive system. We are learning the functions of the digestive system. We are learning the difference between diffusion and osmosis.

What is it? essentially a tube that extends from the mouth to the anus

Basic functions Ingestion- Food is taken into the body Digestion- Food is being broken down Absorption- Nutrients from food are absorbed (#1 function!!!) Elimination- Solid wastes are excreted

Absorption process by which food that has already been broken down passes through the walls of the intestine into the bloodstream. takes place mainly in the small intestine.

Absorption process by which food that has already been broken down passes through the walls of the intestine into the bloodstream. takes place mainly in the small intestine.

parts mouth (physical and chemical dig) esophagus (movement of food via peristalsis) stomach (physical digestion via churning and chemical digestion via enzymes and acid) pancreas (secretes insulin and enzymes into intestines) gall bladder (stores bile) liver (secretes bile which breaks up fats) intestines (absorbs nutrients and water) rectum/anus (stores waste to be excreted)

The Digestive System Esophagus Liver Stomach Pancreas Gall Bladder Large Intestine (colon) Small Intestine Rectum Anus

Diffusion Process by which important chemicals enter our cells. A natural process by which, chemicals move from an area of high concentration (density) to low.

Osmosis Process by which water flows inside a cell. Water will flow to the area of high solute (dissolved material) concentration to try and equalize the concentration.

Osmosis Concentrations Equal amount of water inside / outside of cell. Too little water inside cell Too much water inside cell

Learning goals We are learning the organs of the digestive system. We are learning the functions of the digestive system. We are learning the difference between diffusion and osmosis.