Digestive System

The Digestive System

Biology8/11/23

Digestive System

Function::To break down large insoluble molecules into simple soluble molecules which can be absorbed by the blood.Main Organs: Mouth, Oesophagus, Stomach, Large intestine and Small intestine

Life Processes

Movement-Escape from dangerRespiration-Get energy from foodSense-Respond to stimuli ans smell foodGrow-Increase in sizeReproduce-Produce youngExcretion- Get rid of wasteNutrition-Feeding and eating food

Circulatory System

Main Organs: Heart, veins, arteries.Function: Transport of materials, protection and maintaining body temperature.

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1.)

Skeletal and excretory systems

Skeletal:Main Organs: Bones, joints, musclesFunction: Support, movement and protection

Excretory:Main Organs: Kidney, Liver, Bladder, SkinFunction:Removal of poisonous waste products at the kidneys

Respiratory System

Main Organs: Lungs, nose, windpipe, diaphragm

Function: For gas exchange in the lungs

Ingestion

Taking food into the body.

Digestion

Turning large, insoluble molecules into small soluble ones.

Egestion

Getting rid of undigested food as feces.

Food Tests:

Glucose: Benedicts solution, heat in a water bath. Blue to start then turns to a brick red precipateStarch:Add a drop of iodine. Orange/brown to start blue-black to finish.Fats:Add a drop to filter paper. Collur at start is opaque, in the end there is a translucent spot.Protein:Add a few drops of sodium hydroxide, then a few drops of copper sulphate. Very pale blue/colourless to purple.

Absorption

The soluble products of digestion move into the bloodstream.

Protein

Sources:Fish,Milk,Eggs and cheeseUsed for:Protein is for growth. They are used to make new cells and repaiR damaged tissue.

Vitamins and Minerals

Sources:Pork, trout, peas, asparagus, fruitUsed for: Vitamins and minerals ars needed in small amounts to help us keep healthy, e.g iron for the blood

Why does food have to be digested?

So the large, insoluble molecules can be broken down into small, soluble molecules which can be absorbed into the bloodstream.

Carbohydrate

Sources: Rice, bread, jams and cereals.Used for: Carbohydrates like sugar and starch are our high-energy foods, but eat too much and they turn to fat.

Fats

Sources:Butter, dairy products, piesUsed for: Fats are used to store energy. They also insulate our bodies so that we dont lose a lot of heat.

VS

Enzymes

An Enzyme is a biological catalyst-it speeds up chemical reactions.Digestion of Carbohydrates: The molecules must be broken down into smaller glucose molecules, which a starch molecule is made up of many.The enzyme is called amylases.Digestion of fats: The molecules must be broken down into smaller fatty acids and glycerol molecules, which a fat molecule consists of many. The enzyme is called Lipases.

Digestion of Proteins: The molecules must be broken down into smaller amino-acid molecules, a protein molecule consists on many different amino acids. The enzyme is called Proteases.Enzymes:Speed up digestionWork best at the normal body temperature Are affected by the pH of the liquid around them.Look at the digestive system diagram

The End

Statistics convey professionalism and a greater sense of credibility.A plus: always try to include the source.

Statistics convey professionalism and a stronger sense of credibility.A plus: always try to include the source.

Statistics convey professionalism and a greater sense of truthfulness.A bonus: always try to include the source.

Statistics convey professionalism and a greater sense of authenticity.A plus: always try to include the source.