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Quiz on Excretion, created by eleanorbooty on 20/11/2014.

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Excretion

Excretion

Question 1 of 10

1

Name the parts of the nephron.

Select one or more of the following:

  • Renal Pelvis

  • Cortex

  • Arterioles (afferent/efferent)

  • Collecting duct

Explanation

Question 2 of 10

1

In what process is blood plasma filtered from the nephron (glomerulus) and flows into the proximal convoluted tube.

Select one or more of the following:

  • Reabsorption

  • Filtration

  • Secretion

  • Excretion

Explanation

Question 3 of 10

1

What is the process of reabsorption?

Select one or more of the following:

  • Most of the viscuous glomerular filtrate is returned to the blood vessels surrounding the convoluted tubules.

  • The remaining fluid becomes urine, which travels down the collecting duct to the medullary region of the kidney.

  • The urine (in mammals) is stored in the urinary bladder.

Explanation

Question 4 of 10

1

Why are proteins converted to ammonia?

Select one or more of the following:

  • Because proteins contain a lot of energy and it would be wasteful to excrete them so they are broken down to release energy.

  • Because proteins are more toxic than ammonia.

Explanation

Question 5 of 10

1

Why must proteins not be stored in high quantities?

Select one or more of the following:

  • The amine group is toxic.

  • The nitrogen group is toxic.

  • The R group is toxic.

Explanation

Question 6 of 10

1

Describe the process of deamination.

Select one or more of the following:

  • Amino acid + Oxygen > Keto acid + ammonia

  • Amino acid > Keto acid + ammonia

  • Amino acid > Ammonia

  • Ammonia > Urea

Explanation

Question 7 of 10

1

What happens to keto acid after the process of deamination?

Select one or more of the following:

  • Goes to be used in respiration directly.

  • Goes to be used in protein synthesis.

  • Goes to be used in the ornithine cycle.

Explanation

Question 8 of 10

1

Why must Ammonia be converted to Urea?

Select one or more of the following:

  • Ammonia must not be allowed to accumulate due to its toxicity. And urea is less toxic than ammonia.

  • Ammonia must be broken to release energy for respiration.

Explanation

Question 9 of 10

1

Describe the ornithine cycle.

Select one or more of the following:

  • Ammonia is combined with CO2 to produce urea. Urea is passed back into the blood and transported to the kidneys. The kidneys filter the urea from the blood and stores it in the kidney.

  • Ammonia is combined with CO2 to produce keto acid. Keto acid is transported to the kidneys via the blood. Kidneys filter the keto acid form the blood and is stored in the bladder.

  • Ammonia is combined with CO2 to produce urea. Urea is passed back into the blood and transported to the liver. The liver filters the urea from the blood and stores it in the liver.

Explanation

Question 10 of 10

1

Approximately how much protein do we need a day?

Select one or more of the following:

  • 40 - 60 g

  • 50 - 70 g

  • 100 - 150 g

  • 20 - 30 g

  • 50 - 100 g

Explanation

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