14. Coordination and response
A section of Biology, 0610
Listing 10 of 622 questions
For Examiner's Use The glucose concentration of the blood is maintained within the range 80 – 90 mg per 100 cm3 blood. is a flow chart showing how the body responds to changes in the glucose concentration of the blood after the absorption of a carbohydrate-rich meal and during strenuous exercise. change in blood glucose concentration detected by organ A blood glucose concentration increases above 90 mg per 100 cm3 large carbohydrate-rich meal followed by absorption of glucose from small intestine blood glucose concentration decreases below 80 mg per 100 cm3 organ A releases hormone B into the blood organ A releases hormone C into the blood blood glucose concentration decreases blood glucose concentration increases hormone B stimulates organ D to convert glucose to glycogen hormone C stimulates organ D to convert glycogen to glucose muscle contraction during strenuous exercise blood glucose concentration returns to 80 – 90 mg per 100 cm3 For Examiner's Use Name organ A and hormones B and C. A B C Name organ D that stores glucose as glycogen. Suggest why glucose is converted to glycogen rather than kept as glucose inside the cells. Name the type of control system used in homeostasis that returns the blood glucose concentration to 80 – 90 mg per 100 cm3. Animal hormones are used in the production of milk and meat. Bovine somatotrophin (BST) is used to increase milk production by cows. The hormone is produced by genetically modified bacteria that contain the cattle gene for making BST. It is used in the United States but is banned for use in the European Union. Outline how genes, such as the one for BST, are transferred from the cells of cattle to bacteria. For Examiner's Use Suggest advantages and disadvantages of using hormones, such as BST, in the production of milk and meat. advantages disadvantages
0610_w12_qp_32
THEORY
2012
Paper 3, Variant 2
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Insulin is a hormone that regulates the concentration of glucose in the blood. Define the term hormone. Two people, A and B, visited a doctor to discuss their similar symptoms. The doctor thought that their blood glucose concentrations were not very well controlled. A glucose tolerance test was carried out on both people. A and B did not eat or drink anything other than water for eight hours before the test. They then drank a glucose solution. Blood samples were taken at 30 minute intervals. The samples were tested for glucose concentration. The results are shown in . blood glucose concentration / mg per 100 cm3 time / minutes B A glucose solution taken Use to state the blood glucose concentrations of A and B at 180 minutes. A mg per 100 cm3 B mg per 100 cm3 Calculate the percentage increase in the blood glucose concentration in person A between 60 and 90 minutes. Give your answer to the nearest whole number. Show your working. % Describe how the response of person A differs from the response of person B in . Explain the results of the glucose tolerance test shown by person B. The doctor thought that person A had Type 1 diabetes. Describe three symptoms of Type 1 diabetes.
0610_w18_qp_42
THEORY
2018
Paper 4, Variant 2
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For Examiner's Use Name the term that is used to describe the maintenance of a constant internal environment. State two advantages to a mammal of maintaining a constant body temperature. 1. 2. shows changes in a person’s body temperature before, during and after a period of exercise. exercise begins ends time body temperature / °C Using information from , state the normal body temperature of this person. ºC. Explain what is meant by the term vasodilation. On , label with an X a point when vasodilation is having an effect on the person’s body temperature. For Examiner's Use Explain how vasodilation affects body temperature.
0610_s10_qp_22
THEORY
2010
Paper 2, Variant 2
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Homeostasis is the maintenance of a constant internal environment. Human skin is involved in the maintenance of a constant internal body temperature. Skin is an organ. State why the skin is an organ. State the name of the organ that coordinates the control of body temperature. shows a diagram of a section through human skin. F E D A B C State the names of structures A, B and C in . A B C Structure D is a shunt vessel and E is an arteriole. Describe how these blood vessels are involved in maintaining a constant internal body temperature in a cold environment. Energy is used to maintain body temperature. State three other uses of energy in humans.
0610_s20_qp_42
THEORY
2020
Paper 4, Variant 2
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Questions Discovered
622