B3 Organisation and the Digestive System AQA

B2.2.1 - What does amylase break down?

• Starch
• Glucose
• Protein
• Cellulose

B2.2.3 - What do platelets do?

• Help with blood clotting
• Transport nutrients
• They are part of the body's immune system
• They carry oxygen around the body

B2.2.3 What does blood plasma contain?

• Platelets
• Red blood cells
• All of these
• White blood cells

B2.2.3 - What are these? 

• White blood cells
• Platelets
• Red blood cells
• Blood plasma 

Which one of the following is an adaptation to improving the efficiency of gaseous exchange?

• Clusters of alveoli in the lungs increase the efficiency of gaseous exchange

• The presence of rings of cartilage in the trachea

• The fattened, globular shape of plants such as cacti

How are blood capillaries well-adapted for gaseous exchange?

• There are always very high concentration gradients across capillaries

• Their walls are just one cell thick

• The blood in them is under high pressure

Which chemical test is used to detect the presence of glucose in food?

• Benedict's test

• Iodine test

• Sudan III test (Biuret)

The digestion of which food molecule by enzymes begins in the mouth?

• Glucose

• Protein

• Starch

What is the main function of the small intestine?

• Absorption of digested food molecules

• The breakdown of starch into maltose

• The absorption of water from the gut

What is the function of bile?

• Bile contains hydrochloric acid to provide the optimum pH for protease activity

• Bile contains a mixture of digestive enzymes

• Bile emulsifies lipids to smaller droplets

• Bile neutralises stomach acid