O-LevelBiologyCoordination & Response5090/22 · May/June 2019 · Q710 Marks
The nervous system coordinates body functions.
- (a)(i)Name the type of coordinated response that takes place as a result of a specific stimulus, such as the withdrawal of the hand from a hot object touching the skin.[1]
- (a)(ii)Outline, in the correct sequence, the functions of each named type of neurone involved in producing this coordinated response.[7]
- (b)Suggest why damage to a person's spinal cord may result in the person not being able to produce coordinated responses.[2]
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [1] reflex / involuntary ;
- [7] impulse;
- [7] synapse;
- [7] from + receptor;
- [7] sensory / afferent ;
- [7] relay / inter / intermediate ;
- [7] CNS / spinal cord ;
- [7] motor / efferent ;
- [7] to + effector;
- [7] muscle / named muscle correct for withdrawal reflex;
- [7] sequence mark: point(s) 3/4/5/6 must be ticked before point(s) 7/8/9 ;
- [2] impulse + not transmitted AW ;
- [2] effector / named effector + not activated AW ;
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