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BIOL-UA 6 (14)
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Nerves 3.doc

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Department
Biology
Course
BIOL-UA 6
Professor
davidjenkins
Semester
Spring

Description
Fig. 6 shows a reflex arc involving the arm and the spinal cord. (a) (i) On the diagram, label both the motor neurone and the sensory neurone. (ii) How will the arm respond to the stimulus of the hot object? …………………………………………………………………………………………… . …………………………………………………………………………………………… . (iii) Which of the muscles, A or B, will contract to bring about this response? …………………………………………………………………………………………… . (iv) What is the role of the spinal cord in this reflex action? …………………………………………………………………………………………… . Nervous System Page 1 of 6 …………………………………………………………………………………………[5] (b) (i) How might the response in (a) be affected if the person had drunk some alcohol? ……………………………………………………………………………………………. ……………………………………………………………………………………………. (ii) In a number of countries there are laws which attempt to limit the amount of alcohol drunk by drivers of vehicles. Suggest why drinking alcohol is considered dangerous for drivers. …………………………………………………………………………………………… . …………………………………………………………………………………………… . …………………………………………………………………………………………… . (iii) Suggest two other dangers of the misuse of alcohol, apart from the effects on driving skills. 1. ……………………………………………………………………………………… …………………………………………………………………………………………… . 2. ……………………………………………………………………………………….. …………………………………………………………………………………………[5] Nervous System Page 2 of 6 Fig. 7 is a simplified diagram of the muscles and bones of a human leg. (a) Complete the following sentences. Muscles are formed from cells which have the special property of being able Nervous System Page 3 of 6 to……………………………………….. Because of this, muscles cannot push, they can only ………………………………………………… [2] (b) Muscles operate as antagonistic paWith reference to Fig. 7, explain
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