Question 1(c)
[Maximum number: 1]
Organs in the human body have different functions.
Which row of the table correctly shows whether the kidneys and skin are involved in excretion?
kidneys
skin
no
no
no
yes
yes
no
yes
yes
IGCSE Biology 2.71 Excretory products of the lungs Topic Practice
2.71 Excretory products of the lungs
Know the excretory products of the lungs, kidneys and skin (organs of excretion).
Question 1(b)
[Maximum number: 1]
Read the passage below. Use the information in the passage and your own knowledge to answer the questions that follow.
Treating Kidney Disease
Chronic kidney disease affects approximately 12% of the world's population and many people are unable to obtain treatment. One method of treating chronic kidney disease is by dialysis. The diagram shows how kidney dialysis is done.
During dialysis, blood is taken from an artery in the arm and is pumped through a dialyser. In the dialyser, the blood passes through a long, coiled dialysis tube made of a thin partially permeable membrane. The tube is surrounded by dialysis fluid. The dialysis fluid contains glucose and ions at concentrations normally found in blood plasma, but does not contain urea. The urea passes from the blood into the dialysis fluid. The temperature in the dialyser is kept at . After passing through the dialyser, the blood is returned to a vein in the arm. Kidney dialysis can take up to three hours and must be done three times a week.
Scientists have now designed a new bioartificial kidney. This artificial kidney is a combination of engineering and living cells. This artificial kidney has a haemofilter made from artificial membranes that filter the blood. The substances filtered out of the blood then pass through a device called a bioreactor. This bioreactor absorbs useful substances back into the blood. The bioreactor is made of living nephron cells that are grown from stem cells. These cells are separated from the patient's blood by a silicon membrane to prevent the immune system rejecting them. Bioartificial kidneys are the same size as a human kidney and will be fitted inside the body to replace a kidney. The bioartificial kidney can react to changes in the body in the same way as a normal kidney.
Urea is an excretory product that is released by the kidneys.
Give the name of an excretory product that is released by the lungs.
Question 2(a)(i)
[Maximum number: 1]
The lungs and the kidneys are excretory organs.
Which substances are excreted by the lungs?
A
carbon dioxide and urea
B
carbon dioxide and water
C
carbon dioxide, urea, and water
D
urea and water
Question 6(b)(ii)
[Maximum number: 1]
The diagram shows a nephron of a kidney, with some of the structures labelled.
In homeostasis, the kidney is involved in the control of blood concentration.
Another function carried out by the kidney is excretion.
State what is meant by the term excretion.
Question 7(b)
[Maximum number: 1]
The human kidney is an organ that is able to process excretory products from human metabolism.
Name another organ that carries out excretion in the human body.