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Biology

CAIE2024

Different species of animal have neurones with different characteristics. (a) Fig. 1.1 is a diagram of a motor neurone of a rat and a motor neurone of a snail. axon (diameter of 7 μm) rat motor neurone Schwann cell C A B cell body snail motor neurone axon (diameter of 40 μm) Fig. 1.1 (i) Name the structures labelled A, B and C on Fig. 1.1. A ........................................................................................................................................ B ........................................................................................................................................ C ........................................................................................................................................ [3] (ii) The rat motor neurone has an impulse transmission speed of 50 m s–1. The snail motor neurone has an impulse transmission speed of 8 m s–1. Explain why the rat motor neurone has a faster impulse transmission speed than the snail motor neurone. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [2] (cid:300)(cid:205)(cid:266)(cid:190)(cid:288)(cid:180)(cid:237)(cid:200)(cid:245)(cid:207)(cid:298)(cid:197)(cid:266)(cid:221)(cid:252)(cid:183)(cid:254)(cid:215) © UCLES 2024 (cid:300)(cid:228)(cid:200)(cid:249)(cid:206)(cid:299)(cid:246)(cid:300)(cid:212)(cid:265)(cid:255)(cid:216)(cid:260)(cid:179)(cid:191)(cid:251)(cid:277)(cid:258) 9700/43/O/N/24 (cid:293)(cid:213)(cid:293)(cid:213)(cid:245)(cid:245)(cid:261)(cid:181)(cid:181)(cid:229)(cid:261)(cid:197)(cid:261)(cid:277)(cid:229)(cid:245)(cid:181)(cid:213) NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD PMT * 0000800000003 *

Question

Biology

CAIE2022

F ig. 2.1 shows a diagram of a motor neurone. dendrite synaptic knob nucleus B Schwann cell A C Fig. 2. 1 ( a) Name the structures labelled A, B and C on F ig. 2.1. A ............................................................................................................................................... B ............................................................................................................................................... C ............................................................................................................................................... [3 ] ( b) Describe the function of a motor neurone. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2] © UCLES 2019 97 00/04/SP/22 PMT

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