Name: 5 Homeostasis and response

5 Homeostasis and response higher (import)

Name: Class: Date:

________________________ ________________________ ________________________

Time: Marks: Comments:

53 minutes 53 marks

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1

Describe how the brain is informed of the image detected by the retina.

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2

A man hurt his head in an accident. Doctors found that he could not remember anything that had happened on the day of the

accident.

(a) (i) Name the part of the brain concerned with memory.

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(ii) Name one method the doctors could use to find out how much the brain was damaged.

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(b) The doctors were worried that the man might also have injured his spine. They touched different areas of his skin with a sharp point. They asked him to tell them each time if he could feel the sharp point.

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(i) Explain how the information about the sharp point touching the skin reaches the man's brain.

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(ii) The doctors found that the man could feel the sharp point when the point touched his arms but not when the point touched his legs.

Suggest what this information could tell the doctors about the damage to the man's spinal cord. Explain your answer.

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(2) (Total 10 marks)

3

In-vitro fertilisation (IVF) is used to help some women get pregnant.

(a) Name the two hormones used in IVF treatment.

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2 ..................................................................................................................... (2)

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(b) The diagram shows the process of IVF.

Describe the process of IVF. Use information from the diagram to help you. ........................................................................................................................ ........................................................................................................................ ........................................................................................................................ ........................................................................................................................ ........................................................................................................................ ........................................................................................................................ ........................................................................................................................ ........................................................................................................................ ........................................................................................................................

(4) (Total 6 marks)

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4

The internal body temperature determines how much a person sweats. The graph shows the effect of different internal body temperatures on a person's rate of energy loss by sweating.

(a) How much more energy was lost from the body each second by sweating when the body temperature was 37.6 ?C than when it was 36.6 ?C? Show clearly how you work out your final answer. ..................................................................................................................................... ..................................................................................................................................... Amount of energy = ................................ joules per second (2)

(b) Explain why a person would feel more thirsty when the body temperature was 37.6 ?C than when it was 36.6 ?C. ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... (2)

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