IB SEHS Option D

Where does salivary amylase break down food?

• Mouth

• Stomach

• Small intestine

• Large intestine

What is the typical pH range in the stomach?

• 1 - 4

• 4 - 5

• 5.5 - 7.5

• 6.0 - 8.0

Select the correct response for an enzyme

• It is a lipid

• They are non-specific (they target any molecules)

• They work optimally under any pH environment

• It is a catalyst that speeds up the breakdown of molecules

In regards to enzymes, select the incorrect statement

• Enzymes aid in the breakdown of large food molecules into smaller more soluble substances that can be absorbed into the blood

• Slow down the rate of reaction

• Different enzymes with different functions are produced in particular areas of the digestive tract

• Most enzymes only catalyse one reaction

The enzyme responsible for breaking down protein in the stomach is

• Salivary amylase

• Pancreatic amylase

• Pancreatic lipase

• Bile

• Pepsin

Select the incorrect statement for the absorption from the intestinal lumen to the capillary network

• Proteins enter the lymphatic system

• Carbohydrates are absorbed as monosaccharides

• All substrates (CHO, fatty acids & protein) cross the brush border membrane and passes through the cytosol of the absorptive cell

• Lipids cross the basolateral membrane

In regards to water, which of the following statements is incorrect?

• Water is essential for all metabolic processes in the body

• Water helps to regulate body temperature

• Water helps to lubricate joints

• Excess water helps to increase the concentration of sodium in the blood

Which of the following is incorrect in terms of where extracellular fluid is found

• Blood plasma

• Lymph

• In cells

• Fluid secreted by glands

The water distribution of trained athletes is lower than untrained individuals

• True

• False

Which is correct for a simple negative feedback model?

• Sensor - controller - effector - feedback (then repeat)

• Sensor -feedback - controller - effector (then repeat)

• Sensor - controller - feedback - effector (then repeat)