O-LevelBiologyCoordination & Response5090/22 · May/June 2021 · Q710 Marks
The diagram shows structures involved in a reflex action that results in removal of a person's hand from a sharp object. [Figure 7.1]
- (a)(i)Name and state the function of: structure P structure R. [4][4]
- (a)(ii)Describe the location of structure Q in the nervous system. [2][2]
- (b)Explain how the action of structure S results in the movement of bones at a named type of joint. [4][4]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [4] (structure P) 1 sensory / afferent + neurone / nerve ;
- [4] 2 from + receptor ;
- [4] (structure R) 3 motor / efferent + neurone / nerve ;
- [4] 4 to + effector / muscle / biceps / S ;
- [4] 5 impulse ;
- [2] 1 CNS / central nervous system / grey matter ;
- [2] 2 spinal cord ;
- [3] 1 hinge ;
- [3] (any three from:) 2 contracts ;
- [3] 3 pulls / jerks;
- [3] 4 radius + ulna ;
- [3] 5 up / towards humerus / away from / flexion ;
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