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14.4. Homeostasis
A subsection of Biology, 0610, through 14. Coordination and response
Listing 10 of 120 questions
For Examiner's Use A person’s blood glucose concentration should remain within narrow limits. Name the process that keeps conditions inside the body within narrow limits. Name the main process that uses glucose from the blood. The graph, , shows the blood glucose concentration of a boy over 14 hours. am am am noon time of day pm pm pm pm meal blood glucose / mg per 100 cm3 blood leaves school leaves school leaves school For Examiner's Use The boy had a meal at about 7.45 am. What was the boy’s blood glucose concentration before this meal? mg per 100 cm3 blood What was the boy’s maximum blood glucose concentration after this meal? mg per 100 cm3 blood After the meal the boy’s pancreas secreted a hormone that helped to remove excess glucose from the blood and store it. On mark with a letter G when the pancreas started to secrete this hormone. State the form in which glucose is stored in the body. State one organ in the body where this storage occurs. On the way home from school, the boy was involved in a fight. State what happened to the boy’s blood glucose concentration at the start of the fight. During the fight the boy’s body produced another hormone. Name this hormone. Describe three effects this hormone had on the boy’s body.
0610_s12_qp_23
THEORY
2012
Paper 2, Variant 3
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is a diagram that shows the control of blood glucose concentration. blood glucose concentration at 90 mg per 100 cm3 blood glucose concentration at 90 mg per 100 cm3 blood glucose concentration below 90 mg per 100 cm3 blood glucose concentration above 90 mg per 100 cm3 increase in glucose in the blood storage of glucose as glycogen decrease in glucose in the blood breakdown of glycogen to glucose State one reason why the concentration of glucose in the blood increases. State one reason why the concentration of glucose in the blood decreases. Name two places in the body where glycogen is stored. Explain how an increase in glucose concentration is controlled in the body. If the blood glucose concentration is very high there is a decrease in the water potential of the blood. This may damage the red blood cells. Explain how a decrease in water potential of the blood may damage red blood cells.
0610_s14_qp_31
THEORY
2014
Paper 3, Variant 1
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shows the changes in glucose concentration of the blood. set level time high blood glucose concentration low blood glucose concentration A B C Name the process that maintains blood glucose concentration within set limits. Name the hormone that would be secreted in response to the increasing blood glucose concentration at A in . Name an organ that is responsible for the decrease in blood glucose concentration after B in . Name the compound that is converted to glucose at C in . [ 1 10 Describe the symptoms and treatment of Type 1 diabetes. 1 10
0610_s16_qp_42
THEORY
2016
Paper 4, Variant 2
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Insulin is a protein made by cells in the pancreas. shows how insulin is made in a pancreatic cell. amino acids assembled to form insulin amino acids nucleus DNA A B not to scale State the name of molecule A in . State the name of structure B in . Explain the role of molecule A in protein synthesis, as shown in . Insulin is secreted from cells in the pancreas when the concentration of glucose in the blood increases. Outline the role of insulin. State the names of two substances, other than insulin, that are secreted by the pancreas.
0610_s21_qp_43
THEORY
2021
Paper 4, Variant 3
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Questions Discovered
120