14. Coordination and response
A section of Biology, 0610
Listing 10 of 622 questions
For Examiner's Use Explain the term balanced diet. State three factors that influence a person’s nutritional needs. For Examiner's Use Glucose is absorbed in the small intestine and transported in the blood. The kidneys filter the blood and reabsorb the glucose. If the blood contains more than 180 mg of glucose per 100 cm3, the kidney cannot reabsorb it all and some is present in the urine. This figure is called the renal threshold. A doctor suspects that a patient has diabetes because a urine test is positive for glucose. The patient takes a glucose tolerance test by drinking a solution of glucose. The doctor records the patient’s blood glucose concentration at 30 minute intervals for five and a half hours. The results are plotted on . blood glucose concentration / mg per 100 cm3 time / minutes glucose drink Draw a horizontal line on to show the renal threshold. State the time period when the kidney will produce urine containing glucose. Sketch on the blood glucose concentrations that the doctor might expect if he repeated this test on someone who does not have diabetes. For Examiner's Use People who do not have diabetes maintain their blood glucose concentration below 180 mg per 100 cm3. Explain how the body does this.
0610_w13_qp_31
THEORY
2013
Paper 3, Variant 1
View
shows part of the thoracic and abdominal cavities of a human. G H J K L M N O P thoracic cavity abdominal cavity Name the structures labelled G, H and M. G H M Table 3.1 shows five functions of organs in the abdominal cavity. Complete the table by: • naming the organ that carries out each function • using the letters from to identify the organ named. One row has been completed for you. Table 3.1 function name letter from conversion of glucose to glycogen secretion of insulin and glucagon pancreas K absorption of products of digestion storage of bile chemical digestion of protein in an acidic pH Fat is particularly difficult to digest as it is not water soluble and forms spherical globules in the alimentary canal. is a diagram showing what happens to fat globules when mixed with bile. fat globules Name the process shown in . Explain the advantage of the process shown in . Insulin and glucagon are hormones secreted by the pancreas to control the concentration of glucose in the blood. Complete Table 3.2 to show how the uptake of glucose by cells and the concentration of glucose in the blood respond when the two hormones are secreted. Use the words increases, decreases and stays the same to complete the table. Table 3.2 hormone uptake of glucose by cells concentration of glucose in the blood insulin glucagon State another hormone that influences the concentration of glucose in the blood. Explain why the control of the concentration of glucose in the blood is an example of negative feedback.
0610_w15_qp_32
THEORY
2015
Paper 3, Variant 2
View
shows a diagram of the liver and the blood vessels that enter and exit from it. to the heart from the heart small intestine liver J K L M Name blood vessel L. Blood vessel J is a vein. State two structural features of veins and explain how each feature is related to its function of returning blood to the heart. feature explanation feature explanation Blood samples were taken from each of the blood vessels J, K, L and M two hours after a meal of rice. Table 2.1 shows the concentration of glucose in these blood samples. Table 2.1 blood vessel blood glucose concentration / mg per 100 cm3 J K L M Calculate the percentage increase in blood glucose concentration between blood vessel J compared with L. Express your answer to the nearest whole number. Show your working. % Control of blood glucose by the liver is an example of homeostasis. Explain how the liver lowers blood glucose concentration when it is too high. Name one other factor in the human body that is also controlled by homeostasis. Amino acids are processed by the liver. Describe this process. State one other function of the liver, besides homeostasis and processing amino acids.
0610_w15_qp_33
THEORY
2015
Paper 3, Variant 3
View
A person with diabetes may be unable to make insulin. Insulin belongs to an important group of chemicals made by the body. State the name of this group of chemicals. State where insulin is produced in the body. State the function of insulin. A person with diabetes may need regular injections of insulin. State how the insulin is transported to different parts of the body. Human insulin can be made by genetically engineered bacteria. Define the term genetic engineering. State one example of genetic engineering in crop plants.
0610_w17_qp_33
THEORY
2017
Paper 3, Variant 3
View
For Examiner's Use shows a diagram of human skin in hot weather. A B capillaries arteriole C D Name structures A to D. A B C D For Examiner's Use Describe how the structures (A to D) in the skin help to maintain a constant body temperature. You may refer to the structures by their letters. Blood flow through the skin changes in response to changes in the air temperature. State and explain what happens to blood flow through the skin when the temperature of the surrounding air becomes very cold. Explain how the changes you have described in reduce heat loss. For Examiner's Use The control of body temperature is an example of negative feedback. Describe how negative feedback is involved in the control of body temperature.
0610_w10_qp_33
THEORY
2010
Paper 3, Variant 3
View
Questions Discovered
622