Human Nervous System 1

1) A common way to measure reflex reactions is to perform a ruler drop test. In the image below, the girl can be seen dropping a ruler vertically, whilst the boy must try and catch it. The boy’s response can be measured by recording the distance at which his fingers catch the ruler. The results of the experiment were recorded in the table below. Calculate the mean distance the ruler was dropped in mm 2 Marks

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2) The mean reaction time can be estimated using the equation below. Calculate the mean reaction time in s. Give your answer to 2 significant figures 3 Marks

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3) Name the location of the receptor in this reflex 1 Marks

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4) Describe the pathway taken by a nerve impulse in this reflex, from the receptor you named in part c 4 Marks

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5) At the end of each neurone, information must pass onto the next neurone via a junction known as a synapse. Explain how this information passes across the synapse 3 Marks

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6) Reflex reactions take place all over the body. Why are they so important for human survival? 2 Marks

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