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Mark scheme- COORDINATION AND RESPONSE MCQ 1a, 2d, 3a, 4b, 5b SECTION B Q1 (a) (i) A-Lens, B- Cornea, C-Optic nerve (ii) Retina (iii) Ciliary body b. 1. Pupil size is increased (dilated) to allow as much light as possible to enter the eye; 2. Radial muscles contract; 3. Circular muscles relax. 4. Retina detects the brightness of light entering the eye; 5. An impulse passes to the brain along sensory neurons and travels back to the muscles of the iris along motor neurons, triggering a response (pupil dilated). Q2.a. muscle or gland (b) (i) a rapid/fast/immediate/instantaneous; automatic/involuntary response (to a stimulus); [2] (ii) (controlled/coordinated by) spinal cord; [1] (c) (i) adrenaline; [1] (ii) 1 increase in blood pressure; 2 increase in heart rate/increased cardiac output/OWTTE; 3 increase in breathing rate; 4 glycogen converted to glucose/increase in blood glucose; 5 more blood flow to (skeletal) muscles/less blood flow to skin/gut; 6 pupils dilate; 7 hairs raised; any three – 1 mark each [3] [Total: 10] Q3