Download Mark scheme- COORDINATION AND RESPONSE MCQ 1a, 2d, 3a

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