14. Coordination and response
A section of Biology, 0610
Listing 10 of 622 questions
For Examiner's Use The skin is important in helping to maintain a constant body temperature. shows a section through human skin. On label and name three structures that help to maintain body temperature. Put your labels and lines on For Examiner's Use When a student has been running, the body temperature usually rises above normal. Explain how sweating and vasodilation help to lower the body temperature. sweating vasodilation Suggest one function of the skin, other than the control of body temperature.
0610_s12_qp_21
THEORY
2012
Paper 2, Variant 1
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The flow of blood through the skin can be investigated by using a flow-meter. shows a flow-meter above a section through the skin. flow-meter T S ring of muscle P Q R skin Not drawn to scale State the name of cell P. State the types of blood vessel labelled Q, S and T. Q S T State the name of the tissue at R that provides insulation. The blood flow through the skin of some volunteers was measured with a flow-meter when their skin was exposed to different temperatures. Capsaicin is a compound that gives people the sensation of feeling hot when it is put on the skin. Researchers applied capsaicin to the skin of the volunteers and again measured the blood flow through their skin at different temperatures. shows the results. temperature of the skin surface / °C with capsaicin with capsaicin without capsaicin average blood flow as a percentage of maximum blood flow Use the information in to describe the effect of increasing the temperature of the skin surface on blood flow to the skin without capsaicin. Explain the mechanism that increases blood flow through the skin. State the difference between the average blood flow for the treatments (with and without capsaicin) at 35 °C. Space for working. % The researchers thought that capsaicin stimulated receptors in the skin. Explain the process by which capsaicin could reach these receptors. Explain the importance of regulating body temperature in humans. Body temperature is controlled by both hormones and nerves. Explain how co-ordination by hormones differs from co-ordination by nerves.
0610_s18_qp_41
THEORY
2018
Paper 4, Variant 1
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Questions Discovered
622