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13. Excretion in humans
A section of Biology, 0610
Listing 10 of 267 questions
For Examiner's Use State what is meant by the term excretion. Name the main substance that is excreted in expired air. Urine contains water. Name two other excretory products found in the urine of a healthy person. and shows the kidneys and associated structures. key direction of blood flow A B Name the structures labelled A and B. A B For Examiner's Use In the digestive system, proteins are digested into amino acids. Describe what happens to any of these amino acids that are in excess, and how their breakdown product is removed from the body.
0610_w12_qp_22
THEORY
2012
Paper 2, Variant 2
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For Examiner's Use State what is meant by the term excretion. Name the main substance that is excreted in expired air. Urine contains water. Name two other excretory products found in the urine of a healthy person. and shows the kidneys and associated structures. key direction of blood flow A B Name the structures labelled A and B. A B For Examiner's Use In the digestive system, proteins are digested into amino acids. Describe what happens to any of these amino acids that are in excess, and how their breakdown product is removed from the body.
0610_w12_qp_23
THEORY
2012
Paper 2, Variant 3
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Define the term excretion. is a diagram of a kidney tubule and its blood supply. blood blood The concentrations of solutes in the fluids at regions 1, 2, 3 and 4 were determined. The results are shown in Table 2.1. Table 2.1 substance concentration / g dm–3 region 1 region 2 region 3 region 4 glucose 0.9 0.9 0.2 0.0 protein 82.0 0.0 0.0 0.0 salts 8.0 8.0 9.6 16.5 urea 0.2 0.2 0.2 20.0 State the substance or substances in Table 2.1 which: has molecules which are too large to be filtered; has molecules which are small enough to be filtered but is completely reabsorbed from the fluid in the kidney tubule; increases in concentration as fluid moves along the kidney tubule. State three structures through which the fluid from region 4 passes as it leaves the body. One role of the kidney is to maintain the concentration of the blood plasma. Name the process of maintaining constant conditions within the body.
0610_w14_qp_32
THEORY
2014
Paper 3, Variant 2
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Questions Discovered
267