1 Organisisation 3

Question 1

Amylase breaks starch down into what?

Answer 1

Maltose and other sugars

Question 2

What are the products of digestion used for?

Answer 2

• To build new carbohydrates, lipids and proteins

- Some glucose is used for respiration

Question 3

What do you do when testing for sugar?

Answer 3

Benedict’s test

1. Put 5cm*3 of the food sample in a test tube
2. Prepare a water bath for 75 C
3. Add Benedict’s solution to the test tube (approx 10 drops) using a pipette
4. Put the test tube in the bath using a test tube holder, leave it for 5 minutes make sure the test tube is printing away from you
5. If the food sample contains (reducing) sugar the solution will change from a blue colour to green, yellow or brick-red (depending on how much sugar is in the food)

Question 4

What do you do when testing for starch?

Answer 4

The iodine test

1. Put 5cm*3 if your food sample in a test tube
2. Add a few drops of iodine solution & gently shake to mix the contents
3. If the sample contains starch the colour will change from brown/organe to black/blue-black

Question 5

What do you do when testing for protein?

Answer 5

Biuret test

1. Put 2cm*3 of your food sample in a test tube
2. Add 2cm*3 of biuret solution to it and mix them by gently shaking
3. If the sample contains contains protein it’ll change from blue to pink or purple, if there’s no protein it’ll stay blue

Question 6

How do you test for lipids?

Answer 6

Sudan III test

Question 7

What’s the upper part of your body called?

Answer 7

The Thorax its separates from the lower half of your body by the diaphragm

Question 8

What surrounds your lungs?

Answer 8

They’re protected by your ribcage and surrounded by the pleural membranes

Question 9

Explain in as much detail as you can how air gets into your lungs?

Answer 9

• air goes through the trachea which splits into the bronchi (2 bronchus)
• the brochi split into smaller tubes called bronchioles
• which end in alveoli where gas exchange takes place

Question 10

How issues gas exchange happen?

Answer 10

• the alveoli are surrounded by a network of blood capillaries
• the blood passing the alveoli returns to the lungs from the rest of the body so contain a lot of CO2
• Oxygen diffuses out of the alveolus (high con) into the blood (low con) and the carbon dioxide does the opposite to be breathed our
• when blood reaches the cells oxygen is released from the red blood cells (high con) to diffuse into the body cells (low con)
• at the same time CO2 is diffuses out of the body cells (high con) into the blood (low con). And is carried back to the lungs