Chapter 3 Digestion

Question 1

The digestive system diagram

Answer 1

Found on goodnotes chapter B3.2

Question 2

Mouth

Answer 2

Chewing breaks the food into pieces that are more easily digested, while saliva mixes with food to begin the process of breaking it down

Question 3

Gullet

Answer 3

Its function is to transport food and fluid, after being swallowed, from the mouth to the stomach.

Question 4

Stomach

Answer 4

The stomach produces acid and enzymes that digest food.The stomach muscles contract periodically, breaking down food to enhance digestion.

Question 5

Carbohydrates

Answer 5

Carbohydrates provide us with the fuel . They contain the chemical elements carbon,hydrogen, and oxygen. Some carbs only contain one sugar unit. The best known of these single sugars is glucose (C8,H12,O6)

Question 6

[Fats]Lipids:

Answer 6

fats (solids) and oils (liquids). They are the most effcient energy store in your body and an important source of energy in your diet.

Question 7

Enzymes

Answer 7

Types of digestive processes:
Starch ---> Glucose 
Carbohydrates ---> Simple Sugars
Protein ---> Amino acids 
Lipids ---> Fatty acids 
Enzymes are biological catalyst that speed up these reactions

Question 8

Capillaries, veins and arteries

Answer 8

All found on the last page on goodnotes

Question 9

Test for starch

Answer 9

Place a small amount of food on the spotting tile
Add a few drops of iodine solution to the food on the spotting tile
Red iodine solution changes blue-black if starch is present

Question 10

Test for sugar

Answer 10

Place a small amount of food in a test tube
Add enough Benedict’s solution to cover the food
Place the test tube into a warm water bath for about 10 mins
Blue Benedict’s solution changes red if glucose is present

Question 11

Test for lipids (fat)

Answer 11

Place a small amount of food to a test tube
Add a few drops of ethanol to the test tube
Shake the test tube with a rubber cap on and leave for 1 min
Pour into another test tube of water
Is fat is present the water should be a cloudy white layer

Question 12

Test for protein

Answer 12

Place a small amount of food to a test tube 
Add 1cm (cubed) of Biuret reagent 
Blue Biuret reagent changes to purple if protein is present