Maintaining Internal Environments (OCR GCSE Combined Science A (Gateway): Biology)

Exam Questions

22 mins8 questions
1a
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9 marks

(i) Diabetes occurs when blood sugar levels are not controlled.

Which hormone reduces blood sugar levels?

 [1]

(ii) Hormones are produced in endocrine glands.

Describe how hormones control different parts of the body.

 [2]

(iii) A glucose tolerance test can help identify if a person has diabetes.

The graphs show a glucose tolerance test in three people A, B, and C.

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ocr-gateway-gcse---glucoregulation-graph

One person is healthy and the other two people have different types of diabetes.

Explain the differences between the three graphs and describe how each person with diabetes could control their blood glucose levels.

Use information from the graphs in your answer.

 [6]

1b
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2 marks

Drugs can be used to treat one type of diabetes. One drug prevents an enzyme working properly.

Suggest how a drug can stop an enzyme working.

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2a
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3 marks

Fig. 20.1 shows a section through the skin on the back of the hand.

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Fig. 20.1

(i) Which part of the skin detects something touching the back of the hand?

[1]

(ii) The body responds when something touches the back of the hand.

Complete the sentences to explain how this happens.

The ..................................... receives impulses from the skin along sensory neurones.

These impulses are processed and other impulses are sent along ..................................... neurones to bring about responses.

[2]

2b
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2 marks

The skin on some areas of the body contains hairs. Modern hair shampoos contain cleaning agents. One cleaning agent is made from fatty acids.

Explain how a polymer found in plants and animals can be treated to obtain these fatty acids.

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