All the volunteers were given the same food for 3 days.

Suggest and explain one reason why they were given the same food.

Using Table 1, what can you conclude about the effectiveness of furosemide and CVT in the removal of excess fluid from the body?

Furosemide is sometimes used to treat high blood pressure.

Suggest how furosemide would cause a decrease in blood pressure.

Furosemide inhibits the absorption of sodium and chloride ions from the filtrate produced in the nephrons.

Explain how furosemide causes an increase in the volume of urine produced.

The scientists also measured the mean rate of flow of blood plasma into the kidneys.

The results the scientists obtained are shown in Table 2.

The mean rate of flow of blood plasma is 60% of the mean rate of blood flow into the kidneys.

How much greater is the flow of blood into the kidneys with furosemide than with group C (placebo) over the 4 hours of the investigation? Give your answer in cm3.

Answer ______________ cm3